PSLE The figure is formed by joining two quarter circles of radius 21 cm. Find the perimeter of the figure. Round your answer to the nearest whole number. Take π = 3.14
Diameter of the quarter circle
= 2 x 21
= 42 cm
Circumference of the quarter circle
=
14 x 3.14 x 42
= 32.97 cm
Circumference of 2 quarter circles
= 2 x 32.97
= 65.94 cm
Perimeter of the figure
= 65.94 + 4 x 21 - 2 x 6
= 65.94 + 84 - 12
= 137.94
≈ 138 cm
Answer(s): 138 cm