Formula - Area of Circle, Volume of Cylinder

http://www.mathwarehouse.com/solid-geometry/cylinder/formula-volume-of-cylinder.php

http://www.wikihow.com/Calculate-the-Volume-of-a-Cylinder

p must stand for perimeter. This is an unusual term as with circles this is normally called circumference.

a=pi*r^2

C=2*pi*r C is circumference

so r=C/(2*pi)

a=pi*r*r=pi*r*C/(2*pi)=r*C/2

Volume of circular cylinder

V=a*h=pi*r*r*h=pi*C/(2*pi)*C/(2*pi)*h=C*C*h/(2*2*pi)

Remember C in this case is the same as p

Rap

Thanks.

"pi*r*C/(2*pi)"

"pi*C/(2*pi)*C/(2*pi)*h"

I am not clear on this part.

Volume
Base area times height
Base Circle A=Pi*R^2
Volume Cylinder. V=Pi*R^2*H

I understand now. Thanks.