Question

find the perimeter of a semicicle with radius 35 cm.​

Answer 1

Answer:

1. r = 35 cm. area = 1/2πr^2 = 1/2*22/7*35*35 =1925 cm2. perimeter = πr+ diameter =22/7*35+70. = 180 cm.
2. r = 4.2 cm. area = 1/2πr^2 = 1/2*22/7*4.2*4.2 = 27.72 cm2. perimeter = πr+ diameter =22/7*4.2+8.4 =21.6 cm.
3. r = 15.4 cm.

Answer 2

Step-by-step explanation:

r = 35 cm. area = 1/2πr^2 = 1/2*22/7*35*35 =1925 cm2. perimeter = πr+ diameter =22/7*35+70. = 180 cm.

r = 4.2 cm. area = 1/2πr^2 = 1/2*22/7*4.2*4.2 = 27.72 cm2. perimeter = πr+ diameter =22/7*4.2+8.4 =21.6 cm.

r = 15.4 cm.

hope it helps you