Question

If the diameter of a circle is 70 cm , what is its circumference?

Answer 1

Diameter of circle = 70cm
Radius = 35m
so , circumference = 2pir
= 2 × 22/ 7× 35
= 2×22×5
= 220m
so, the circumference of circle is 220m

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Answer 2

The circumference of a circle whose diameter is 70 cm is 220 cm

Given :

The diameter of a circle is 70 cm

To find :

The circumference of the circle

Formula :

For a circle of radius r unit the circumference of the circle = 2πr unit

Solution :

Step 1 of 2 :

Find radius of the circle

Here it is given that the diameter of a circle is 70 cm

The radius of the circle

= r

= 70/2 cm

= 35 cm

Step 2 of 2 :

Find circumference of the circle

The circumference of the circle

= 2πr centimetre

$\displaystyle \sf{ = 2 \times \frac{22}{7} \times 35 \: \: cm }$

$\displaystyle \sf{ = 220 \: \: cm }$

The circumference of a circle whose diameter is 70 cm is 220 cm