Find the area of the following circles, given that:
(a) radius = 14 mm (Take π = 22/7)    (b) diameter = 49 m
(c) radius = 5 cm

Solution:

(a) Radius of the circle = 14 mm

Area of circle = πr²

= 22/7 × 14 mm × 14 mm

= 22 × 2 mm × 14 mm

= 616 mm²

(b) Diameter of the circle = 49 m

Therefore, radius = diameter/2 = 24.5 m

Area of circle = πr²

= 22/7 × 24.5 m × 24.5 m

= 22 × 24.5 m × 3.5 m

= 1886.5 m²

(c) Radius of the circle = 5 cm

Area of circle = πr²

= 22/7 × 5 cm × 5 cm

= 550/7 cm²

= 78.57 cm²

☛ Check: NCERT Solutions Class 7 Maths Chapter 11

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Video Solution:

Find the area of the following circles, given that (a) radius = 14 mm (Take π = 22/7) (b) diameter = 49 m (c) radius = 5 cm

Class 7 Maths NCERT Solutions Chapter 11 Exercise 11.3 Question 2

Summary:

The area of the following circles, given that  (a) radius = 14 mm, area = 616 mm²  (b) diameter = 49 m, area = 1886.5 m²  (c) radius = 5 cm, area = 78.57 cm²

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