Area of a Semi-Circle Calculator

How do you find the area of a semi-circle easily? The Area of a Semi-Circle Calculator is a useful tool to quickly determine the area of a semi-circle based on its radius. Simply enter the radius value into the tool and it will display Area of Semi Circle.

Area of a Semi-Circle Calculator

How to calculate Area of a Semi-Circle

What is the Area of a Semi-Circle?

The area of a semi-circle is half the area of a full circle. It’s useful in various fields such as geometry, architecture, and engineering. Calculating this area involves using the radius. The radius is the distance from the center of the circle to its edge.

How to Use the Calculator

To use the calculator, follow these steps:

  1. Enter the radius in the input field labeled “Radius (r)”.
  2. Click the “Calculate” button.
  3. The area will be displayed in the “Area of Semi-Circle” field.

How to Calculate the Area of a Semi-Circle


Area=12×π×r2\text{Area} = \frac{1}{2} \times \pi \times r^2


Variable Description


Radius of the semi-circle

Calculation Steps:

1. First, find the radius.


r=5r = 5

2. Next, square the radius.

r2=52=25r^2 = 5^2 = 25

3. Now, multiply by π (pi).

π×2578.54\pi \times 25 \approx 78.54

4. Finally, divide by 2 to get the semi-circle area.

78.54239.27\frac{78.54}{2} \approx 39.27

Calculation Example

Basic Calculation Advanced Calculation
Radius (r): 5 Radius (r): 5
Angle (θ): 180 Diameter (d): 10
Area: 39.27 Angle (θ): 180
  Area: 39.27


Can I just use the diameter?

Yes, with the advanced mode, you can use the diameter. The calculator will adjust the calculations accordingly.

What if the angle is less than 180 degrees?

If the angle is less than 180°, the calculator will show the area of the sector formed by that angle.

Is π always equal to 3.14?

For simplicity, we use 3.14 for π, but π is an irrational number and its value is approximately 3.14159.

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