Circumference = pi*d
Area = pi*d2/4
So 4*area = pi*d2
4*area/Circumference = pi*d2/(pi*d) = d
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Given diameter = d: circumference = pi*d Given area = a: circumference = 2*sqrt(pi*a) Given an arc of length L subtends an angle x degrees at the centre: circumference = 360*L/x
3.14 to the 2 power
It is used in finding the circumference and area of a circle. Circumference = 2*pi*radius or pi*diameter measured in linear units Area = pi*radius2 measured in square units
Radius is 1/2 of a diameter. 2.5/2 is 1.25. Radius is necessary in finding the circumference and area of a circle.
The diameter is 8. The circumference is 8 pi. The area is 16 pi.