Question

the area of a circle with Centre O is 308 CM square find the perimeter of the shaded semicircle from the following figure​

Answer 1

πr^2 = 308

r^2. = 308× 7 /22

R = 7√2

perimeter of shaded region= πr

= 22/7×7√2

= 22√2 cm

Answer 2

given

area of circle = 308cm

we know that

area of circle=πr^2

according to question

22/7*r^2=308

r^2=308*7/22

$r = \sqrt{98}$

now

perimeter of circle=2πr

$perimeter = 2 \times \pi \times 7 \sqrt{2}$

perimeter=14πroot 2
area of semi circle=7πroot2