Question

I don’t know how to solve this

Answer 1

see explanation

Explanation:

The perimeter is the length of all the sides in the figure.

The arc of the semi- circle is included in this.

length of arc =
`(1)/(2)`πd ← d is the diameter

here d = 8, hence

arc =
`(1)/(2)`π × 8 = 4π ← exact length

Perimeter = 10 + 8 + 10 + 4π ≈ 40.57 in ( nearest hundredth )