# Semicircle Calculator

A circle is formed by the set of points that are at a constant or at a fixed distance (radius) from a fixed point (center) in the plane.

## What is Semicircle Calculator?

'**Semicircle Calculator**' is an online tool that helps to calculate the area and perimeter of the semi-circle. Online Semicircle Calculator helps you to calculate the area and perimeter of the semi-circle within a few seconds.

### Semicircle Calculator

**NOTE:** Please enter the values up to four digits only.

## How to Use Semicircle Calculator?

Please follow the steps below on how to use the calculator:

**Step1:**Choose a drop-down list to calculate the area and perimeter of the semicircle.**Step2:**Enter the radius of the semi-circle in the given input box.**Step3:**Click on the**"Calculate"**button to find the area and perimeter of the semicircle.**Step4:**Click on the**"Reset"**button to clear the fields and enter new values.

## How to Find Semicircle Calculator?

The diameter of a circle divides the circle into two equal semicircles.

The **area of the semicircle** is defined as the amount of space enclosed within the boundary of a semicircle and it is defined as half of the area of a circle. It is measured in square units. The formula to calculate the area of the semicircle is given by

**Area of the semicircle = π r ^{2} / 2 square units**

Where 'r is the radius of the semi-circle.

To find the **perimeter of a semicircle **we need to add the curved section of the semicircle and the length of the diameter at the bottom of the semicircle. The formula to calculate the perimeter of a semicircle is given by

**The perimeter of a semi-circle = π r + 2r units**

Where 'r is the radius of the semi-circle.

**Solved Examples on Semicircle Calculator**

**Example 1:**

Find the area and perimeter of the semicircle if the radius is 5 units?

**Solution:**

Given: Radius = 5 units

Area of the semicircle = π r^{2} / 2

= 3.14 × 25 / 2

= 39.27 units

The perimeter of the semicircle = π r + 2 r

= (π × 5) + (2 × 5)

= 15.707 + 10

= 25.71 units.

**Example 2:**

Find the area and perimeter of the semicircle if the radius is 11 units?

**Solution:**

Given: Radius = 11 units

Area of the semicircle = π r^{2} / 2

= 3.14 × 121 / 2

= 189.97 units

The perimeter of the semicircle = π r + 2 r

= (π × 11) + (2 × 11)

= 34.54 + 22

= 56.54 units.

Similarly, you can try the calculator to find the area and perimeter of the semi-circle

- Radius = 8 units
- Radius = 12 units

**☛ Related Articles:**

**☛ Math Calculators:**

visual curriculum