Question

Find the area of the circles, given that: (a) radius = 20 cm
(b) diameter 42 cm​

Answer 1

Answer:

1257.142 cm and 1386 cm

Step by step Explanation:-

Given ,

Radius = 20 cm

So,

Radius of the circle =

$\pi \times r {2}$

=> 22/7 * 20 * 20

=> 22/7 * 400

=> 1257.142 cm

(ii)diameter = 42 cm

=> radius = 42/2 = 21 cm

=> 22/7 * 21 * 21

=> 22/7 * 441

=> 22*63

=> 1386 cm

Answer 2

Answer:

(a) 125.142cm (b) 1386cm

Step-by-step explanation:

(a) radius =20m

area of circle = pi × radius²

22/7 × 20× 20

22/7×400

=1257.142cm

(b) diameter=42cm

(i) radius=diameter/2

42/2

=21cm

(ii) area of circle= pi × radius

22/7 × 21×21

22/7×441

22×61

=1386cm

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