Circumference = π x diameter = π x 2 x radius
→ Those with a diameter of 18 units which is a radius of 9 units have a circumference of 18 π
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Circumference = pi*diameter So C = pi*18 = 56.5 units (approx).
diameter = circumference divided by pi = 62.8/3.14 = 20
Angular measure of a circle: 2*pi radians. Circumference of a circle with diameter d units: d*pi units
circumference = 2*pi*radius or pi*diameter
If pi is taken as 3.14 then:- Circumference of the circle = pi*18 units Area of the circle = pi*92 square units