Area of a Semicircle Calculator

Use our free online area of a semicircle calculator to find the area of a semi-circle using its radius. A semi-circle is half of a circle.

Find the Area of a Semicircle

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area

Use our free online area of a semicircle calculator to find the area of a semi-circle using its radius. A semi-circle is half of a circle.

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Area of a Semi-Circle Formula:

A = (1/2) * π * r2 semicircle
Where, A = Area of Semicircle r = Radius

Just enter the value of radius in the area of a semicircle calculator to compute the semicircle area within a blink of an eye.

Area of a Semi-Circle: A semi-circle is half of a circle. Area of semi-circle formula is derived from the formula of a circle. Hence the area of a semi-circle is just the half of the area of a circle.

How to Find the Area of a Semicircle To find the area of a semi-circle, you need to know the formula for the area of a circle. This is because, a semi-circle is just the half of a circle and hence the area of a semi-circle is the area of a circle divided by 2. The area of a semi-circle with radius r, is (πr2)/2. π is a constant which is approximately 3.14 or 22/7.

Example:

Find the area of a semicircle with a radius of 5cm?

Solution:

Semi Circle Area = (1/2) × π × 52
= 39.2699cm2


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