Question

Find the circumference of circle whose diameter is-
(i) 17.5 cm (ii) 5.6 cm (iii) 4.9 cm​

Answer 1

$\textbf{Formula used:}$

$\boxed{\bf\,\text{Circumference of circle}=\pi\,d\;\text{units}}$

$\text{where d is the diameter of circle}$

$\text{(i)}$

$\text{Diameter=17.5 cm}$

$\text{Circumference of the circle= \pi\,d }$

$\text{Circumference of the circle= \frac{22}{7}{\times}17.5 }$

$\text{Circumference of the circle= 22{\times}2.5 }$

$\implies\boxed{\textbf{Circumference of the circle=55 cm}}$

$\text{(ii)}$

$\text{Diameter=5.6 cm}$

$\text{Circumference of the circle= \pi\,d }$

$\text{Circumference of the circle= \frac{22}{7}{\times}5.6 }$

$\text{Circumference of the circle= 22{\times}0.8 }$

$\implies\boxed{\textbf{Circumference of the circle=17.6 cm}}$

$\text{(iii)}$

$\text{Diameter=4.9 cm}$

$\text{Circumference of the circle= \pi\,d }$

$\text{Circumference of the circle= \frac{22}{7}{\times}4.9 }$

$\text{Circumference of the circle= 22{\times}0.7 }$

$\implies\boxed{\textbf{Circumference of the circle=15.4 cm}}$

Find more:

Identify the difference of circumference of two concentric circles whose width is 3.5 CM.

A. 22cm

B. 20cm

C. 24cm

D. 26cm

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