Area of Semi Circle at Algebra Den

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Home >> Circle >> Semi-circle >> Area of Semi Circle >>

Area of Semi Circle

Area of Semi Circle Circumference of Semi Circle

Before you study this concept, you are advised to read:

What is Semi-Circle ?

Formula to find area of semi circle is

Area of Semi-Circle = 1
2 X (π) x radius²

Lets try of some examples and find the area of semi-circle

Example 1: Look at the below image and find the area of semi circle whose radius is 5cm. Take pi value as 3.14

Solution : lets add the radius and pi value to the formula of semi-circle and we get

Area of Semi-Circle = 1
2 X (π) X radius²

= 1
2 X 3.14 X 5²

= 1
2 X 3.14 X 25

Solve the equation and we get = 39.25cm²

Example 2: Look at the below image and find the area of semi circle whose diameter is 20cm. Take pi value as 3.14

Solution : As radius is half of diameter we get
Radius = 20 ÷ 2 = 10 cm

lets add the radius and pi value to the formula of semi-circle and we get

Area of Semi-Circle = 1
2 X (π) X radius²

= 1
2 X 3.14 X 10²

= 1
2 X 3.14 X 100

Solve the equation and we get = 157cm²

Study More Solved Questions / Examples

Look at the below image and find the area of shaded semi circle where

A) When Radius is 10 cm
B) When Diameter is 40 cm