## Book: RS Aggarwal - Mathematics

### Chapter: 18. Area of Circle, Sector and Segment

#### Subject: Maths - Class 10th

##### Q. No. 1 of Multiple Choice Questions (MCQ)

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1
##### The area of a circle is 38.5 cm2. The circumference of the circle is

Let the radius if circle be r

Given, Area of circle = 38.5 cm2

Area of circle = πr2

πr2 = 38.5

Since π = 22/7

22/7 × r2= 38.5

r2 = 38.5 × (7/22)

r2 = 12.25

r = √12.25 = 3.5 cm

Radius of circle = 3.5 cm

Circumference of circle = 2πr

= 2 × 22/7 × 3.5 cm

= 22 cm

Circumference of the circle is 22 cm

Let the radius if circle be r

Given, Area of circle = 38.5 cm2

Area of circle = πr2

πr2 = 38.5

Since = 22/7

πr2 = 38.5

22/7 × r2 = 38.5

r2 = 12.25

r = √12.25 = 3.50cm

Radius of circle = 3.5 cm

Circumference of circle = 2πr

= 2 × 22/7 × 3.5

= 22 cm

Circumference of the circle is 22 cm

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