Posted by Megan on .
solve for a: V=4/3pia^2b

MathTrig 
drwls,
V = (4/3) pi a^2 b
This looks like an equation for the volume of an prolate spheroid. (They have the shape of a rugby ball). To solve for a, divide both sides of the equation by (4/3) pi b and then take the positive square root of both sides.