The area of a circle can be derived by the formula A = πr^{2}. 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 = πr^{2}

**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 = πr^{2}

A = π x 5^{2}

A = 3.14159… x 25

A = 78.53982cm^{2} (5 decimal places)

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Great explanation. This took me back to High School.

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Very interesting!

The diagrams are cool too!

Love it!

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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!

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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.

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Interesting

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This is so helpful thanks so much!

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Nice … How to Re-Share this article?

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Great innovation 👍

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Love it too…. Share with a teacherv friend ?

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(◍•ᴗ•◍)❤

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Nice 💖

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

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