Maths

# How to Calculate the Area of a Circle? | Geometry | Maths | Tutorial

The area of a circle can be derived by the formula A = πr2. In this tutorial you will learn how to apply this formula to an example. For explanation on how this formula works read article “Area of a Circle – Proof

Formula

A = πr2

Where:

A = Area

π(pi) = 3.14159…

r = Radius (Half of the diameter)

Example

In this example let’s assume that the diameter of the circle is 10cm. What is the area of the circle?

Solution

Step 1: Work out the radius of the circle

Diameter = 2r

10 = 2r

Radius = 5cm

Step 2: Area of Circle

A = πr2

A = π x 52

A = 3.14159… x 25

A = 78.53982cm2 (5 decimal places)

## 13 thoughts on “How to Calculate the Area of a Circle? | Geometry | Maths | Tutorial”

1. Kevin Anderson says:

Great explanation. This took me back to High School.

Liked by 2 people

2. I have always had trouble with math and my experience with geometry was perplexing ( barely ago a C). Thank you for this tutorial! Have a grand weekend!

Liked by 1 person

3. You’d think if you weren’t an engineer or something you wouldn’t still need to know this stuff, but areas and volumes come into play in everyday life.

Liked by 3 people

4. Woah I really need this for my geometry!!!😃

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