Find the circumferences of the circle whose diameters are
(i) 14cm (ii) 42cm (iii) 63cm (iv) 21 cm
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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
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