Question

2. Find the area of the following circles, given that:

(a) Radius = 14 mm (Take π = 22/7)


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Answer 1

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Radius of circle = 14 mm

We know that,

Area of the circle = πr2

= 22/7 × 142

= 22/7 × 196

= 22 × 28

= 616 mm2

b) Diameter = 49 m

Solution:

We are given that

Diameter of circle (d) = 49 m

So radius (r) = d/2

= 49/2

= 24.5 m

We know that,

Area of the circle = πr2

= 22/7 × (24.5)2

= 22/7 × 600.25

= 22 × 85.75

= 1886.5 m2

(c) Radius = 5 cm

Solution:

We are given that

Radius of circle = 5 cm

We know that,

Area of the circle = πr2

= 22/7 × 52

= 22/7 × 25

= 550/7

= 78.57 cm2

Answer 2

Answer:

Area of a circle=πr

2

(a) Radius=14cm

Area=π(14)

2

=

7

22

(14)(14)

Area=616mm

2

(b) Radius=5cm

Area=π(5)

2

=

7

22

(25)=78.5cm

2