Question

find the perimeter of the figure.
Ch-12 Mensuration.​

Answer 1

Answer:

75 m

Step-by-step explanation:

Given: r = 21 m

sum of straight lines = 2×r = 2×21 = 42 m

now coming to the curved part (arc)

it is ¼th of total circle formed by radius 21 m

so length of curved part = ¼ × 2 × 22 × 21 / 7= 33 m

total = 42 + 33 = 75 m