Question

Find the circumference of the circles, given that:
(a) radius - 21 mm
(b) diameter- 14cm​

Answer 1

Answer:

Circumference of a circle is 2πr

Case I

Radius = 21 mm

Circumference = 2x22/7x21

=132mm

Case II

Radius=14 cm

Circumference =2x22/7x14=

=88cm

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Answer 2

Answer:

132 mm and 44 cm

Step-by-step explanation:

Given,

(i) Radius = 21 mm

So now,

Putting the formula of circumference

(2*π*r)

=> 2*22/7*21

=> 2*22*3

=> 132 mm

or 13.2 cm

(ii) Diameter = 14 cm

here putting the value of circumference

(i.e- π*d)

=> 22/7*14cm

=> 22*2

=> 44 cm

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