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 .
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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
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