Question

Find the perimeter of given figure:

[the answer in book is given 18cm but it doesnt matches] please help me​

Answer 1

≈ 18 cm

Explanation:

1. Find the length of half a circle of radius 3.5 cm:

`\tt \cfrac{C}{2}= \cfrac{2\pi r}{2}=\pi r=3.14\cdot3.5=10.99 \ cm`

2. Find the length of the diameter:

D = 2r = 2 · 3.5 = 7 cm

3. Find the perimeter of the figure:

P = 10.99 + 7 = 17.99 ≈ 18 cm