Calculate Radius, Diameter, and Circumference
For Example
Some useful relations:
Diameter = 2 × radius
Circumference = 2 × π × radius
Also, circumference = π × diameter
Let's consider an example to look at the use of these relations.
Assume that the radius of a circle is 21 cm. Let's find the circumference of the circle.
Circumference = 2 × π × radius
= 2 × 3 × 21 [Using 3 as an estimated value for π]
= 6 × 21
= 126
So, the circumference of the circle is about 126 cm.
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