Question

the area of a circle is 154 cm²,then fine it circumference​

Answer 1

Answer :

Given :

Area of circle = 154 cm²

To Find :

Circumference of circle = ?

Formula used :

Area of circle = πr²

Circumference of circle = 2πr

Solution :

First of all we have to calculate the radius of circle :

Let radius of circle be 'r'

★ Finding radius of circle :

→ Area of circle = πr²

→ 154 = πr²

→ 154 = 22/7 × r²

→ 154 × 7/22 = r²

→ 49 = r²

→ r² = 49

→ r = √49

→ r = 7 cm

Hence,radius of circle is 7 cm.

★ Finding circumference of circle :

➻ Circumference of circle = 2πr

➻ Circumference of circle = 2 × 22/7 × 7

➻ Circumference of circle = 2 × 22

➻ Circumference of circle = 44 cm

Therefore,circumference of circle is 44 cm.

Answer 2

Answer:

44cm

Step-by-step explanation:

Areaofthecircle=πr^  2

 

22/7 ×r^2 =154

r=7cm

Circumferenceofthecircle=2πr=2×  22/7 ×7=44cm

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