Circumference of Semi Circle at Algebra Den

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Home >> Circle >> Semi-circle >> Circumference of Semi Circle >>

Circumference 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 circumference of semi circle is :

Circumference of semi circle = (π) x radius + Diameter

Let's try out some examples to find the circumference of semi circle

Example 1: Look at the below image and find circumference of semi circle whose diameter is 14cm

Solution: As given in question:
Diameter (d) = 14 cm (given)
Radius (r) = 7 (half of diameter i.e. 14 ÷ 2)

Apply formula - circumference of semi circle and we get

Circumference of Semi Circle = (π) x radius + Diameter

22
7 x 7 + 14

22 + 14 = 36

Hence, circumference of semi circle = 36 cm

Example 2: Look at the below image and find circumference of semi circle whose radius is 21 cm

Solution: As given in question:
Radius (r) = 21 cm
Diameter (d) = 42 cm (twice of radius i.e. 21 x 2 = 42)

Apply formula - circumference of semi circle and we get

Circumference of Semi Circle = (π) x radius + Diameter

22
7 x 21 + 42

66 + 42 = 108

Hence, circumference of semi circle =108 cm

Study More Solved Questions / Examples

Look at the image below and find the circumference of shaded semi circle when

A) Diameter is 7cm
B) Radius is 14cm