Question

the area of semicircular region is 308 sq. cm.then its perimeter will be

Answer 1

area of semi circle = π r² /2
⇒π r² /2 = 308
⇒ r² =616/π
        =196
so, radius, r = 14 cm
now perimeter = 2π r/2 = π r
                        =π ×14
                        = 44 cm
∴perimeter = 44 cm

Answer 2

given :
area of semicircular region = 308 square cm.
to find out the area of semi circular path = $\pi$ r² /2 = 308
r² = 616/ $\pi$
∴ r = 14 cm

perimeter = 2$\pi$ r/2 = $\pi$r 
                = $\pi$ * 14
                = 44 cm
∴ perimeter - 44 cm