Question

If a wire is bent in the shape of a square, the area of the square is 49cm2
. When the wire is bent into a semi-
circle shape, find the radius of the semi-circle (take π=22/7).

Answer 1

area of Square : 49 cm²

side : √49=7 cm

perimeter = 7*4= 28 cm

now,

perimeter of semi circle is 28 cm

I. e. πr = 28

thus r =

28*7/22

8.9 cm ( ans)