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The Area of a Circle is 1386 Sq.Cm ; Find Its Circumference. - Mathematics

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Sum

The area of a circle is 1386 sq.cm; find its circumference.

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Solution

Area of circle = 1386 cm2
πr2 = 1386

`22/7r^2 = 1386`

`r^2 = 1386 xx 7/22`

`r^2 = 441`

r = `sqrt(441)`

r = 21 cm

circumference = `2pir`

= `2 xx 22/7 xx 21`

= 132 m

Concept: Area of Circle
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APPEARS IN

Selina Concise Mathematics Class 8 ICSE
Chapter 20 Area of a Trapezium and a Polygon
Exercise 20 (D) | Q 4 | Page 234
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