Question

Find the perimeter of the figure. Round your answer to the nearest tenth.

Answer 1

87.2 cm

Explanation:

First, I'd calculate the half circumference of the semi circle provided.

The formula for circumference is c = 2
`\pi`r, or d
`\pi`. Half of it would just be c/2 = r
`\pi`

Since our diameter is 30 cm, our radius is 15 cm.

Circumference = 15
`\pi` ≈ 47.21 cm

The rest of the figure's perimeter is just adding together 10 + 10 +20.

So, 47.21 + 10 + 10 + 20

= 47.21 + 40

= 87.21 cm

Then, you round to the nearest tenth.

I hope this helps!