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Answer:

14cm ,42cm ,63cm ,21cm

Step-by-step explanation:

( i) diameter = 14cm

∴ radius r=

2

14

=7cm

circumference=2πr=2×

7

22

×7=44cm

(ii ) Circumference =2πr

∴2πr=42

⇒2(

7

22

)r=42

⇒r=

22

147

≈6.68 cm

Since, the diameter of the circle is twice of it radius.

∴d=2r

⇒d=2(

22

147

)=

11

147

≈13.36

Thus, the diameter of the given circle is

11

147cm

(iii)

r = 63/2

Therefore,

Circumference = 2*pie*r

= 2*22/7 * 63/2

= 2*11*9

= 198 unit^2

(iv)

r = 63/2

Therefore,

Circumference = 2*pie*r

= 2*22/7 * 63/2

= 2*11*9

= 198 unit^2