Question

find the perimeter of a semicircle if it is radius is 4.2 CM​

Answer 1

Step-by-step explanation:

perimeter of circle 2πr=2*π*4.2cm= 26.389 cm.

perimeter of semi circle = 1/2*26.389…cm = 13.19cm

area of circle - πr² =π*(4.2cm)² =55.417 cm²

area of semi-circle - 1/2*55.417…cm² = 27.7 cm².

Answer 2

Answer:

perimeter of circle 2πr=2*π*4.2cm= 26.389 cm.

perimeter of semi circle = 1/2*26.389…cm = 13.19cm

area of circle - πr² =π*(4.2cm)² =55.417 cm²

area of semi-circle - 1/2*55.417…cm² = 27.7 cm².