Question

find perimeter of this ​

Answer 1

Answer:

Perimeter of the semi-circle = 25.7 cm

Step-by-step explanation:

It is given that diameter of this semi-circle = 10 cm.

We have to find its perimeter.

Perimeter of a semi-circle = Circumference of a semi-circle + 2r = (πr + 2r) units

Here r = radius of the semi-circle

Diameter of the semi-circle = 2 × radius

10 = radius × 2

radius = 10/2 = 5 cm.

So, perimeter of the semi-circle = (πr + 2r) = r(π + 2) = 5 (3.14 + 2)

= 5 × 5.14 = 25.7 cm

Perimeter of the semi-circle = 25.7 cm