In order to calculate the area or the circumference of the circle, you need to know the radius of the circle.
What is a circle?
A circle is a curve sketched out by a point moving in a plane so that its distance from a given point is constant; alternatively, it is the shape formed by all points in a plane that are at a set distance from a given point, the centre.
The calculate the area of the circle, the formula is written as,
[tex]\text{Area of circle}=\pi r^2[/tex]
And the circumference of the circle is calculated using the formula,
[tex]\text{Area of circumference} = 2\pi r[/tex]
where r is the radius of the circle.
Thus, in order to calculate the area or the circumference of the circle you need to know the radius of the circle.
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