Question

what is the length of radius of circle of area 1386 sp cm

Answer 1

Area of the circle = πr^2
Given area = 1386
r^2 = 1386 × 7 /22
r^2 = 441
r = 21

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Answer 2

area of circle =1386 cm square
Radius=?
area=22/7×r square
1386=22/7×r square
r^2=1386×7/22
r=√1386×7/22
r=21