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Q: Area of a Circle = (d^2) x .785 where d = diameter...Why??? ( No Answer,   3 Comments ) Question
 Subject: Area of a Circle = (d^2) x .785 where d = diameter...Why??? Category: Science > Math Asked by: herkdrvr-ga List Price: \$5.00 Posted: 07 Jul 2006 04:41 PDT Expires: 07 Jul 2006 06:18 PDT Question ID: 744045
 ```The area of a circle is pi(r^2), however, there is another relationship, specifically d^2 (.785) to arrive at the same answer. The .785 comes from an approximation of pi/4, which is apparently derived from a circle inscribed within a square. My question is, how does one arrive at pi/4 by incribing a circle in a square? There are a lot of web references on incribing a square within a circle, but not the other way around. Thanks in advance! Herkdrvr``` There is no answer at this time. ```They are the same formula: r = d/2 r^2 = (d/2)^2 = d^2/4```
 ```Redhoss has answered the formula part of the question. I notice that you're asking about a circle in a square also... I'm not sure what that has to do with the rest of your question since you've already determined that the diameter is d. So whether the circle is in a square or not, the diameter is the same.```
 ```Sheesh...I knew it was simpler than I was making it. Thanks!``` 