Question

find the circumference of a circle whose diameter is 10 cm

Answer 1

Given - Diameter

Find - Circumference

Solution - The circumference of the circle is 31.4 centimetres.

The circumference of the circle is given by the formula = 2πr.

Radius = diameter/2

Radius = 10/2

Radius = 5 centimetres

Keep the values in the formula to find the value of the circumference of the circle.

Circumference = 2*3.14*5

Circumference = 31.4 centimetres

Thus, the circumference of the circle is 31.4 centimetres.

Answer 2

The circumference of a circle whose diameter is 42 centimetre is 31.4 cm

Given :

The diameter of a circle is 10 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 10 cm

The radius of the circle

= r

= 10/2 cm

= 5 cm

Step 2 of 2 :

Find circumference of the circle

The circumference of the circle

= 2πr centimetre

$\displaystyle \sf{ = 2 \times \frac{22}{7} \times 5 \: \: cm }$

$\displaystyle \sf{ = \frac{220}{7} \: \: cm }$

$\displaystyle \sf{ = 31.4 \: \: cm }$

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