PSLE Math 2021 Paper 2 Question 16

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(Area and Perimeter of Circles and Composite Figures Question)

PSLE Math 2021 Paper 2 Question 16

Handwritten mathematics notes and diagrams illustrating the transformation of a circle into a new shape with labeled measurements. Includes two figures showing the original circle and the modified shape, with calculations for area and perimeter.

a) Ans: 329.7
42 - 32 = 10
10 ÷ 2 = 5
Radius of B circle → 5 + 8 = 13
Area of shaded part → (3.14 × 13 × 13) - (3.14 × 8 × 8) = 329.7

b) Ans: 141.88
Circumference of big circle → 3.14 × 13 × 2 = 81.64
Circumference of small circle → 3.14 × 8 × 2 = 50.24
81.64 + 50.24 + 5 + 5 = 141.88

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