Question

2×5=10

1. Find the area of a circle of radius 20 cm

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Answer 1

Answer:

8800 / 7 cm² ( or ) 1257.14 cm² ( approximately )

Step-by-step explanation:

Given,

Radius ( r ) = 20 cm

Formula : -

Ar ( circle ) = π r²

= ( 22 / 7 ) × 20²

= ( 22 / 7 ) × 20 × 20

= ( 22 × 20 × 20 ) / 7

= 8800 / 7 cm²

( or )

= 1257.14 cm² ( approximately )

Answer 2

Answer:

1256 sq cm

Step-by-step explanation:

Given that

Radius of circle is 20cm

To find

Area of circle

Solution

As we know that

$area \: of \: circle = \pi \times {radius}^{2}$

hence

take

$\pi = 3.14$

now

$area \: of \: circle = 3.14 \times 20 \times 20$

hence by multiplication we get

$area \: of \: circle = 1256 {cm}^{2}$