Originally Posted by

**Masterthief1324** I decided to abide by logic in order to reconstruct the formula for the volume of a sphere. Juxtapose against the actual formula, my formula does not match.

Why is it so?

My reasoning:

Let r be the radius of a circle.

1. I first use 'r' to find its 90 degree sector (is this how you would express finding a particular sector of a circle?), then I have area 'x'.

$\displaystyle \frac {90}{360} = \frac {x}{(\pi)r^2}$ ;where x is the area of the sector.

**2. If I take x, or its equivalent fraction, and multiply it by the circumference of the circle with the radius of 'r' I should get the volume of half the sphere.**

Why not?