It is often useful to be able to find the midpoint of a segment. Given the radius of a circle calculate the area circumference and diameter. Write down the formula for finding the circumference of a circle using the diameter.
To calculate the diameter of a circle multiply the radius by 2.
That is to say you can find the circumference of a circle just by multiplying the diameter by pi. The diameter of a circle can be calculated using the formula d 2r where d indicates the diameter and r denotes the radius of the circle. The Diameter of a circle divided the circle into two equal parts known as semi-circle. If the diameter of a circle is 88cm then the radius turns out to be 44cm.