The ball pool

A square having side length 12 contains a quarter, semi and full circle. The centres of the latter two are connected to the square’s centre to form a green triangle. What is it’s area?

Scroll down for a solution to this problem.


The green area is 11.

Solution by Jane Miller.


Ball pool
A game you play with cue and balls
Playing the match you choose
And may be win or loose
Just set your goal and try a strike
You will get better and better
Ball at front
Ball in the centre
The balls are rolling
And don’t roll by chance
Thanks your skilful hands


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