Question

Hi i will mark as brain list
the perimeter of a semicircle is 108 cm what is the area of the semicircle ❓

Options are
1)636
2)693
3)1272
3)1386

tell me correct answer with step by step explanation ​

Answer 1

hey!!...

the perimeter = (pi)r + 2r where r is the radius.

Here

r[(22/7) + 2] = 108, or

r = 108/[(22/7) + 2] = 21

So the area of the semicircle is

(pi)*(21^2)/2

= 693 sq cm.