Q4 of 11 Page 52

The circumference of a circle is 96.8 m. Find its area.

Given: circumference of the circle = 96.8 m

And we know circumference of a circle is given by


Circumference = 2πr, where r = radius of the circle


⇒ r = circumference/2π


⇒


⇒


⇒ radius = 15.4 m



To find area of this circle:


Area is given by


Area = πr2


⇒ Area = 22/7 × 15.42


⇒ Area = (22 × 15.4 × 15.4)/7


⇒ Area = 5217.52/7 = 745.36 m2


Thus, area of circle is 745.36 m2.


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2

The radii of some circles are given below. Find their area.

(1) 28 cm (2) 5.6 m


(3) 7.7 m (4) 6.3 m


(5) 35 cm

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(1) 1386 sq cm (2) 346.5 sq cm


(3) 3850 sq m (4) 301.84 sq m


(5) 24.64 sq m

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