# How To: Find the area of a circle when you know the diameter

In this video, it is shown how to calculate the area of a circle where the diameter is given. The formula for calculating the area of a circle is pi multiplied by square of radius. Radius is actually half of the diameter. In this video, the diameter is given as 10.6 meters. Hence, the radius will be half of 10.6 which is equal to 5.3 meters. Now, to find the area we shall multiply pi with the square of 5.3. Square of 5.3 is 28.09. If we multiply 28.09 with pi we shall get the area of the circle. The approximate value of pi is 3.14. So here we shall multiply 3.14 with 28.09 which is equal to 88.2026. Hence, the area of the circle with diameter 10.6 is 88.2026 meter square approximately.

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