Question
A piece of string is used to make the figure shown. Inside the big semicircle are 2 small circles and 3 small semi-circles, all of which have the same radius. The diameter of the big semicircle is 42 m. Find the area of the shaded region. (Leave your answer in terms of π)
4 m

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A piece of string is used to make the figure shown. Inside the big semicircle are 2 small circles and 3 small semi-circles, all of which have the same radius. The diameter of the big semicircle is 42 m. Find the area of the shaded region. (Leave your answer in terms of π)