You can rapidly get the area of half a circle with our semicircle area calculator. Furthermore, the tool functions as a semicircle perimeter calculator, so entering a radius or diameter will help you identify the shape’s essential properties in the blink of an eye. In the* article below*, we define a semicircle and explain how to calculate its perimeter and area.

## What is a semicircle? Semicircle definition

A semicircle is just half a **circle**. A semicircle is made by cutting a circle along a diameter line – or, in other words, through the circle center. The prefix **semi**– emanated from Latin and means “half” or “partially” (like in words such as semi-permanent, semi-formal, semifinals). You won’t forget what a semicircle is now that you know the etymology. Simply remember how the semifinals are related to the finals, and you’ll learn how to connect a semicircle to a circle.

## How to calculate semicircle area and its formula

The radius or diameter of a semicircle can be used to compute the area of the semicircle. For example, the area of a semicircle may be calculated using the following formula: A=\pi r^2 /2= \pi d^2 / 8 ; where ‘r’ is the radius and ‘d’ is the diameter.

## The perimeter of a semicircle formula

A semicircle’s perimeter equals half of its **circumference **plus its **diameter**. So, to determine the perimeter of a semicircle, use the perimeter of a semicircle formula. But, first, we need to know the diameter or radius of a circle and the length of the arc. So, to get the length of the semicircle’s arc, we must first determine the diameter of a process.

The perimeter of a semicircle formula =

\pi R + d \textrm{ or } \pi R + 2R \textrm{ units,} \textrm{ or } R (\pi + 2)**r** = is the radius of a semicircle

**pi** is 3.142 approximately.

**d** = Diameter of a semicircle