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Posted: 1/30/2022 4:22:28 PM EDT
[#1]
Quote HistoryQuoted: To be honest after doing so many classes and such on shaft design this past semester I am used to the diameter based area equation A = pi/4 *d^2 but I assume by the OP you mean he thought it was A=d^2 
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Posted: 1/30/2022 4:23:08 PM EDT
[#2]
Quoted: I work with a person who holds a BS and MS in a hard science and an MBA. They asked me if the area of a circle was it's diameter squared. while I can do that, I doubt I could solve a simple differential equation, and couldn't remember how to do a derivative the other day. There was a time when I could: do math in Hex, Octal, and Binary in my head. Do Diff Eq now its simple algebra and geometry - and sometimes only barely. You really do lose it if you don't use it. |
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Posted: 1/30/2022 4:29:59 PM EDT
[#3]
Yep. I sure do (and without looking it up).
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Posted: 1/30/2022 4:30:06 PM EDT
[#4]
You have to use pie!!
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Posted: 1/30/2022 4:35:06 PM EDT
[#5]
Dia Squared X .7854
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Posted: 1/30/2022 4:35:40 PM EDT
[#6]
Quote Historyyes, yes you do. all i learned in college was pi to nine decimal points and my SSN. |
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Posted: 1/30/2022 4:53:31 PM EDT
[#7]
Quote HistoryQuoted: Dia Squared X .7854 This. A circle fills up 78.5% of a square. So, diameter squared x 0.785 |
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Posted: 1/30/2022 5:08:42 PM EDT
[#8]
Converted my swiming pool to a fish pond.
Needed to figure out how many gallons of water my inground pool holds for the new filter for the fish I put in the pool. 20 x 40 pool with a 10 foot radius on each end = 728 square ft x average depth x 7.48 gallons per cubic foot. Aprox 25,000 gallons. |
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Posted: 1/30/2022 5:11:09 PM EDT
[#9]
Quote HistoryQuoted: Converted my swiming pool to a fish pond. Needed to figure out how many gallons of water my inground pool holds for the new filter for the fish I put in the pool. 20 x 40 pool with a 10 foot radius on each end = 728 square ft x average depth x 7.48 gallons per cubic foot. Aprox 25,000 gallons. i'm too lazy to math it all out. 
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Posted: 1/30/2022 5:16:11 PM EDT
[#10]
Quote HistoryQuoted: I remember with a rhyme. "To get the area declared, use Pi r squared" Circumference though...I can't ever remember that one. 2*pi*r. There are 2 pi radians in a circle. |
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Posted: 1/30/2022 5:20:14 PM EDT
[#11]
Quote HistoryQuoted: Pi are round. |
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Posted: 1/30/2022 5:21:05 PM EDT
[#12]
Diameter squared X .7854
Not that pi r^2 is hard, just what I use. |
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Posted: 1/30/2022 5:21:59 PM EDT
[#13]
Quote HistoryQuoted: [Diameter^2]pi/4 is generally the most convenient form since we mostly work in diameters, not radii. Mostly. Same here. I rarely ever needed to calculate the volume of a sphere, so that equation I always have to look up. |
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Posted: 1/30/2022 5:33:03 PM EDT
[#14]
Pi r actually round. Cake r².
Beat 12 times apparently. |
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Posted: 1/30/2022 5:33:58 PM EDT
[#15]
Some Old Hippie, Caught Another Hippie, Trippin on Acid
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Posted: 1/30/2022 5:41:08 PM EDT
[#16]
Yep, I do.
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Posted: 1/30/2022 6:18:43 PM EDT
[#17]
Quote HistoryQuoted: Some Old Hippie, Caught Another Hippie, Trippin on Acid H_o * (H_t/A) That doesn't look right. 
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Posted: 1/30/2022 6:41:53 PM EDT
[#18]
I did up to calc 3, linear algebra, and dif eq. I had a friend who needed remedial help with his gen ed math course and I wasn’t able to immediately work the problem like he expected I could. I explained that the higher you get up in math courses, the less you rely on earlier concepts and the more specific your knowledge becomes.
Math was never easy for me and I had to work hard to pass the courses so when I read about someone that once went through the coursework and subsequently forgot things, then I can relate. However, finding the area of a circle is elementary and everyone should know it. |
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Posted: 1/30/2022 6:46:01 PM EDT
[#19]
Quote HistoryQuoted: I hope your friend studied a little more before taking the PE. Quote HistoryQuoted: Quoted: A friend of mine was studying for his Professional Engineer exam. He asked me what the equation was for the volume of a sphere, so I told him. He stared at me for a couple of seconds and then asked "Why the fuck do you know that?" I don't know. I just do. I hope your friend studied a little more before taking the PE. He passed his first time through, so I presume so. |
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Posted: 1/30/2022 6:46:05 PM EDT
[#20]
I’ve noticed I’ve stopped worrying about these things when I have what is essentially the entire breadth of human knowledge at my finger típs. Shit only gets real when I’m playing Trivial Pursuit. 4.0 math gpa through Calc 2. Can’t remember a damn thing about it, thank god the kids are only asking me basic algebra and geometry questions at the moment.
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Posted: 1/30/2022 6:50:40 PM EDT
[#21]
Quote HistoryQuoted: Some Old Hippie, Caught Another Hippie, Trippin on Acid I used a lot of tricks to remember formulas. Even that one for sohcahtoa. It doesn’t always work so easy; I had to brute force memorize the whole unit circle in trig. |
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Posted: 1/30/2022 6:51:12 PM EDT
[#22]
Quote HistoryQuoted: Some Old Hippie, Caught Another Hippie, Trippin on Acid I used a lot of tricks to remember formulas. Even that one for sohcahtoa. It doesn’t always work so easy; I had to brute force memorize the whole unit circle in trig. |
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Posted: 1/30/2022 6:51:25 PM EDT
[#23]
Quote HistoryQuoted: Some Old Hippie, Caught Another Hippie, Trippin on Acid I used a lot of tricks to remember formulas. Even that one for sohcahtoa. It doesn’t always work so easy; I had to brute force memorize the whole unit circle in trig. |
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Posted: 1/30/2022 6:51:37 PM EDT
[#24]
Quote HistoryQuoted: Some Old Hippie, Caught Another Hippie, Trippin on Acid I used a lot of tricks to remember formulas. Even that one for sohcahtoa. It doesn’t always work so easy; I had to brute force memorize the whole unit circle in trig. |
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Posted: 1/30/2022 6:54:20 PM EDT
[#25]
Pie r not square, Pie r round.
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Posted: 1/30/2022 7:10:18 PM EDT
[#26]
Quote HistoryQuoted: 8 slices. on round pizzas of course. |
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Posted: 1/30/2022 7:34:27 PM EDT
[#27]
when a treadmill, whats the diameter of a square that fully fits within a circle which has radius 1?
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Posted: 1/30/2022 8:06:54 PM EDT
[#28]
Quote HistoryQuoted: Being smart and not knowing something outside your field of experience describes every smart person. On the other hand, the other day my machinist told me a mechanical engineer was watching him put a threaded hole in a part for him. When he pulled out a drill bit to drill the hole the engineer asked him what he was doing because he thought you just took a tap in pushed it into the metal to get a threaded hole.  That's exactly what smart people do.  Attached File |
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Posted: 1/30/2022 8:09:42 PM EDT
[#29]
Pie is definitely an American bias (pastry). Strudel r2.
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Posted: 1/30/2022 8:54:13 PM EDT
[#30]
Quote HistoryQuoted: Pi are round. No shit! |
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Posted: 1/30/2022 9:10:53 PM EDT
[#31]
Circumference and area were beat into my head during magnetic particle class. It has since fallen out.
Now it's sine, sine, everywhere a sine. And cosines and tangents but that's a whole 'nother rant. |
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Posted: 1/30/2022 9:12:00 PM EDT
[#32]
Pie Are Squared
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Posted: 1/30/2022 9:17:09 PM EDT
[#33]
A=pd²/4. I'm an engineer not a mathematician.
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Posted: 1/30/2022 9:20:53 PM EDT
[#34]
Maybe
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Posted: 1/30/2022 9:24:40 PM EDT
[#35]
I know it, but I work with cad and it’s always been a click away… for at least 20 years lol
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Posted: 1/30/2022 9:28:47 PM EDT
[#36]
Well, I can sort this out. Let's bust out the Mandelbrot set!
While we're at it, let's do some statistical analysis on all these circles. Factor analysis, discriminant analysis, Analysis of Variance, and maybe some Canonical Correlations for good measure... Yeah, that was all like a million years ago. Anymore I have a hard time doing advanced math, you know, like addition and subtraction.
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Posted: 1/30/2022 9:35:40 PM EDT
[#37]
Quote HistoryQuoted: That's exactly what smart people do. https://www.ar15.com/media/mediaFiles/322543/Dewalt-Tap-Drills-Set_jpg-2260593.JPG Not form taps… |
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Posted: 1/30/2022 9:35:40 PM EDT
[#38]
Quoted: I work with a person who holds a BS and MS in a hard science and an MBA. They asked me if the area of a circle was it's diameter squared. |
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Posted: 1/30/2022 9:39:40 PM EDT
[#39]
2r*2r*.8=A
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Posted: 1/30/2022 9:54:58 PM EDT
[#40]
easy. guess who helps 11 and 13 year olds with math.
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Posted: 1/30/2022 9:59:46 PM EDT
[#41]
Pi are round, cornbread are square.
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Posted: 1/30/2022 10:03:18 PM EDT
[#42]
Pie are Not Square. They are Round.
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Posted: 1/30/2022 10:06:04 PM EDT
[#43]
Quote HistoryQuoted: Pi are round. Yes......cornbread are square. |
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Posted: 1/30/2022 10:06:42 PM EDT
[#44]
Quote HistoryQuoted: If you do the area calculation of a L pizza (12") vs a M pizza (8") you'll realize the L is more than twice as much pizza. Follow me for more adult tips. You're welcome.  Gino's in Albuquerque gives the area of their pizza sizes, on their menu, for the APS grads trying to understand the benefit of buying the larger size. Pretty smart, but it's probably still lost on most as he doesn't point out the rest of the equation, cost per square inch. Most grocery stores give the cost per UOM for most items and most seem to ignore it.
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Posted: 1/30/2022 10:09:16 PM EDT
[#45]
Pi are squared and pie are round.
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Posted: 1/30/2022 10:13:52 PM EDT
[#46]
Just like a lot of things you learned in school the further away from school you get the less you will remember them. Unless it's something you use all the time.
I'm guessing there are very few times in life most people would ever need to know the area of a circle, triangle, many other shapes. Being in the sawing business I do know how. |
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Posted: 1/30/2022 10:16:04 PM EDT
[#47]
Pie R square.
No, no, no, pie are round, cornbread are square! ^Shit my dad said when I was a kid. lol |
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Posted: 1/30/2022 10:19:34 PM EDT
[#48]
Pies are squared.
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Posted: 1/30/2022 10:44:55 PM EDT
[#49]
Quote HistoryQuoted: Being smart and not knowing something outside your field of experience describes every smart person. On the other hand, the other day my machinist told me a mechanical engineer was watching him put a threaded hole in a part for him. When he pulled out a drill bit to drill the hole the engineer asked him what he was doing because he thought you just took a tap in pushed it into the metal to get a threaded hole. Were you talked down to by an engineer very early in your career, and it embarrassed you significantly in front of the rest of your crew/gang/shift? Your comments in this thread demonstrate a resentment or disgust for engineers, or college educated individuals. |
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Posted: 1/30/2022 10:46:53 PM EDT
[#50]
Quote HistoryQuoted: I hope your friend studied a little more before taking the PE. Quote HistoryQuoted: Quoted: A friend of mine was studying for his Professional Engineer exam. He asked me what the equation was for the volume of a sphere, so I told him. He stared at me for a couple of seconds and then asked "Why the fuck do you know that?" I don't know. I just do. I hope your friend studied a little more before taking the PE. |
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