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## Homework Statement

A circle with a radius of (a/2) is bored through the centre of a sphere of radius a. Find the volume of the remaining solid.

## Homework Equations

## The Attempt at a Solution

I've been trying this for an hour now and I've been trying to find the remaining volume by finding the area of the cylinder bored + the little side bits on each side. I've just been getting really messy answers which aren't close to the actual answer.

Urgently need a hand :)