How do you calculate the circumference of a circle?

We can calculate the circumference of a circle of a circle using diameter(d) from the formula (C= πd). Using the formula (C=2πr), we can calculate the circumference from radius(r).

How do you find diameter from circumference?

Given the circumference (c), we can calculate diameter(d) from the formula: Diameter = C/π

How do you find the size of a circle?

We can find the size(A) of a circle from radius(r) using the formula: A = π r2. We can find the size(A) of a circle from Diameter(D) using the formula: A = π (D/2)2.

Find radius, diameter, circumference of a circle

What is radius?

Radius of a circle is the distance from the center of the circle to the circumference.

What is Circumference?

Circumference of a circle is the length of the circular line that marks the limits of a circle.
Diameter to radius ratio is 2:1.

What is The area of a circle?

The area of a circle is the space contained within the circumference and is measured in square units.

What is the formula for area of a circle?

Formula for area of a circle is π (Pi) times the Radius squared; A = π × r2.

What is the formula for Circumference?

formula for Circumference = π × diameter = 2 × π × radius. Use the apps, videos and worksheet available on this page to learn the formulas to find the area and circumference of the circle.