Question

A piece of a wire is in the form of a rectangle whose length and breadth are 40and 26cm respectively . It is rebent in form of a circle . Find the radius of the circle

Answer 1

Perimeter of rectangle = 2(l+b)
2(40+26)
2(66)
=132 cm
Circumference of circle = 132 cm
Circumference/Diameter = π =22/7
132/D = 22/7
22D = 924
D = 42
r = D/2
r=42/2
r=21cm