find the diameter of circles having the following areas 1) 693/2
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Area of a circle=πr^2 or πd^2/4.
Given,
πr^2=693/2
r^2=693/2 x 1/π
r^2= 693/2 x 7/22.
r^2= 441/4
r=√441/√4
r=21/2.
r=10.5
d=2 x 10.5
d=21
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