Math K-Plus

Area Of A Circle Calculator

TestQuizQuiz Results Help. Print       

How To Find The Area Of A Circle?

Let's look at the geometric characteristics of a circle. But first, please review the definition of Area Of Two-Dimensional Shapes.
  • The widest length is through the center of the circle. This length is known as the Diameter of the circle; In the example, it is shown as "D" in the diameter.
  • If you draw a line from the exact center of the diagram to any edge of the circle, this is called the Radius; In the example, the radius is shown as "R". Also the radius is half the value of the diameter.
  • To compute the Area Of A Circle, you will use Pi as part of the formula.
  • Special note, the diameter of a Circle must be greater than zero.

Area Of A Circle Formula
Area = π × radius × radius =
π × r2


Area Of A Circle Calculator
Field Name User Input
Length Of R
You can enter up to 6 digits
Your Answer
You can enter up to 10 digits
Correct Answer

Generate a new Area Of A Circle of a Circle  problem for the student to solve.