Question

a wire in the form of a rectangle 1 8.7 cm long and 14.3 cm wide is received and went into the form of a circle find the radius of circle so formed .​

Answer 1

perimeter of rect .is 2(l+b)=66. - (1)

perimeter of circle =2πr. -(2)

(1)=(2) because both made from same wire

2πr=66

r=21/2