PSLE Math 2022 Paper 2 Question 8
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(John Composite Figures Area & Perimeter Question)
PSLE Math 2022 Paper 2 Question 8
a) Arc of 3/4 circle -> 3/4 x 22/7 x 28 = 66
Arc of 1/4 circle -> 1/4 x 22/7 x 56 = 44
Shaded perimeter -> 66 + 44 + 14 + 14 = 138cm
b) Ans: 630cm^2
Area of 3/4 circle -> 3/4 x 22/7 x 14 x 14 = 462
Area of quadrant -> 1/4 x 22/7 x 28 x 28 = 616
Square - Quadrant -> (28 x 28) – 616 = 168
Shaded area -> 462 + 268 = 630