Question

the diameter of circle is 7cm its circumference is .......

Answer 1

As the circumference formula is=2×22/7×r(2 pie r)

Here,diameter is 7 cm. So radius is 7/2=3.5 cm.

So according to formula=(2×22/7×3.5)cm
=22 cm

Answer 2

The circumference of a circle whose diameter is 7 cm is 22 cm

Given :

The diameter of a circle is 7 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 7 cm

The radius of the circle

= r cm

= 7/2 cm

= 3.5 cm

Step 2 of 2 :

Find circumference of the circle

The circumference of the circle

= 2πr centimetre

$\displaystyle \sf{ = 2 \times \frac{22}{7} \times 3.5 \: \: cm }$

$\displaystyle \sf{ = 2 \times 22 \times 0.5 \: \: cm}$

$\displaystyle \sf{ = 22\: \: cm}$

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