Question

The diameter of semi-circular protracter is 7cm. Find its perimeter and area ​

Answer 1

Answer:

Perimeter = 18cm

Area = 11/4cm²

Step-by-step explanation:

Given,

Diameter (d) = 7cm

Radius(r) = d/2 = 7/2

Area =

$1 \div 2\pi \: r^{2}$

So, 1/2*22/7*(7/2)²

= 11/7*7/4

= 77/28

= 11/4cm²

Perimeter =

$2\pi \: r \div 2 + d$

$= \pi \: r + d$

= 22/7*7/2 + 7

= 11+7 = 18cm

Hope it helps! :)

Someone correct me if I'm wrong