Teacher2Teacher

Q&A #6082

Teachers' Lounge Discussion: Conic Sections: Circles

T2T || FAQ || Ask T2T || Teachers' Lounge || Browse || Search || T2T Associates || About T2T

View entire discussion

From: Loyd

To: Teacher2Teacher Public Discussion
Date: 2003112616:20:07
Subject: Early Egyptian formula for circle.

In book, "Outline of History" vol 1, the formula is given as (8/9 diameter)^2 If you change it to (16/9 radius)^2 you would get: 3.160493827 r^2 Thus, the estimate for pi is 3.160493827. Not bad since this is only about a one percent error. The Eqyptians found the volume of their graineries by multiplying the area of the circular base by the height. Thus they got the volume of a cylinder to an accuracy "Good enough for dynasty work."

Post a reply to this message
Post a related public discussion message
Ask Teacher2Teacher a new question


[Privacy Policy] [Terms of Use]

_____________________________________
Math Forum Home || The Math Library || Quick Reference || Math Forum Search
_____________________________________

Teacher2Teacher - T2T ®
© 1994- The Math Forum at NCTM. All rights reserved.
http://mathforum.org/