Question

Find
of the
the perimeter
of the semi circle whose diameter is 42cm​

Answer 1

Answer:

66cm²

Explanation:

Perimeter of a circle = 2πr

Perimeter of a semi circle = 2πr/2 = πr

diameter of circle = 42

radius of circle = 42/2 = 21

Perimeter = 22/7× 21

= 66cm²

hope it helps! :))