there is no option here for making diagram is it?

Is the shaded area enclosed by the four circles?

Here is a way to do it.

Link the four centers of the circles to get a square. Take a whole circle's area away from the square's area.

The shaded area = 24^2 - pi(12^2) cm^2

Can you finish the calculation?

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Attn: Actually, you take away 4 quarter circles' area away, which is equal to a whole circle's area.