If the area of a circle is 81- then its circumference is

The correct option is C 18π Area of a circle : A = #160; π r^2=81π⇒ r^2=81⇒ r=9 Circumference of a circle : #160; C=2π r⇒ C=2π ( 9 )=18π ...

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Byju's Answer

Standard VII

Mathematics

Perimeter of Square and Rectangle

If the area o...

Question

If the area of a circle is $81 π$ then its circumference is

61 π

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20 π

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18 π

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16 π

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Solution

The correct option is C $18 π$
Area of a circle : A = $π r^{2} = 81 π \Rightarrow r^{2} = 81 \Rightarrow r = 9$
Circumference of a circle : $C = 2 π r \Rightarrow C = 2 π (9) = 18 π$

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If the area of a circle is 81π then its circumference is

The correct option is C 18πArea of a circle : A = πr2=81π⇒r2=81⇒r=9Circumference of a circle : C=2πr⇒C=2π(9)=18π

If the area of a circle is $81 π$ then its circumference is

The correct option is C $18 π$
Area of a circle : A = $π r^{2} = 81 π \Rightarrow r^{2} = 81 \Rightarrow r = 9$
Circumference of a circle : $C = 2 π r \Rightarrow C = 2 π (9) = 18 π$