Question

the radius is 10cm .Find the perimeter of the quater of the circle (take pi = 3.14)​

Answer 1

circumference of a circle

$2\pi \: r$

2*3.14*10

2*31.4

=62.8

Answer 2

Question :

The radius is 10 cm. Find the perimeter of the quarter of the circle.

Solution :

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$\boxed {\tt Area \: of \: quarter \: of \: circle \: = \dfrac{ \pi r^2 }{4} }$

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$: \implies \tt { Area = \dfrac{3.14 \times 10^2 }{4} }$

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$: \implies \tt {Area = 78.5 cm^2 }$

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ㅤㅤㅤㅤㅤㅤMethod 2:

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Area of quadrant can also be found using sector Formula :

$\boxed {\tt Area \: of \: sector \: = \dfrac {\theta}{360} \times \pi r^2 }$

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$: \implies \tt { Area \: = \dfrac {90}{360} \times 314 }$

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$: \implies \tt { Area = 78.5cm^2}$