P6 / Raffles Girls / 2020 / SA2 Prelims / Paper 2 – Q15 [4 marks]

Question:

The figure is made up of a big semicircle of radius 30 cm. 2 circles and 3 semicircles of equal radius are drawn in the big semicircle.
(a) What is the radius of the circle?
(b) What is the area of the shaded parts? Take π = 3.14.
Round your answer correct to 1 decimal place.

Solution: