Question

a wire is in the form of circle with diameter 21cm it is cut to bent into a square .find the area of the square

Answer 1

diameter of a circle = 21
radius = 21/2
now.
circumference of circle 2*22/7*r
=2×22×22/7×2
=66cm.

we know...
perimeter of the square = 66cm
4a=66
a = 66/4
a = 16cm.

area of square. = a^2 = 16^2 =16 × 16
=256cm^2