Question

a wire of length 20 m is bent to a circular sector so as its area is maximum.find the radius of that circular sector

Answer 1

circumference of circle == 20cm
circumference == 2πr
20 ==2×22/7×r
20 ==44/7 ×r
( 7/44)×20 == r
70/11 == r
6.36 == r
radius will be 6.36
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