Question

If the perimeter of a semi circular sheet is 216m, find its area

Answer 1

Answer:

Let r be the radius of the semi-circular protractor

Then the perimeter of the protractor is (πr+2r)=

7

36r

According to the problem

7

36r

=72

r=14

Now area of the protractor is

2

πr

2

=

7

11

×14×14

=22×14=308cm

2