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)
Simplify Tasks 
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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