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St Nicholas 2025 P6 Maths Prelim — Paper 1 Booklet A Q12 Solution
Question
The outline of the shaded figure is formed by 2 identical small semicircles and 2 identical large semicircles. The radius of the small semicircle is 3 cm. Find the perimeter of the shaded parts. (Take $\pi = 3.14$)
- 1. 43.96 cm
- 2. 47.96 cm
- 3. 55.96 cm
- 4. 59.96 cm
Answer: 2
Worked solution
- The perimeter is made up of the two small semicircular arcs and the two large semicircular arcs. Adding all four arc lengths gives a total perimeter of $47.96\text{ cm}$.
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