Area of a Circle

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Lesson Objective
In this lesson, we will learn about the area of a circle.
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About This Lesson
In this lesson, we will:
  1. Learn about the formula for the area of a circle
  2. See an example on using the formula to find a circle's area
  3. See another example on using the formula to find the radius of a circle.
The study tips and math video below will explain more.
a circle

Study Tips

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Tip #1
Consider the circle on the right, if the radius of this circle is r, the area, A of the circle will be:
A = πr2
a circle with the radius r

where π is a constant that is approximately equals to 3.14. 

The math video below will give more explanations on this. Also, we will see some examples on how to use the formula.

Math Video

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Lesson Video

If the above player doesn't work, try this direct link.

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Math Video Transcript

Practice Questions & More

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Multiple Choice Questions (MCQ)
Now, let's try some MCQ questions to understand this lesson better.

You can start by going through the series of questions on the area of a circle  or pick your choice of question below.
  1. Question 1 on finding the area of a circle
  2. Question 2 on finding the radius of a circle