Question

find the circumference of a circle whose diameter 15 ( using 22/7 )

Answer 1

Answer:

Appropriate Question :-

• Find the circumference of a circle whose diameter is 15 cm. (Use π = 22/7).

Given :-

• A circle whose diameter is 15 cm.

Formula Used :-

$\clubsuit$ Circumference of Circle Formula :

$\bigstar \: \: \sf\boxed{\bold{\pink{Circumference_{(Circle)} =\: 2{\pi}r}}}\: \: \: \bigstar$

where,

• π = Pie or 22/7
• r = Radius

Solution :-

First, we have to find the radius of a circle :

Given :

• Diameter = 15 cm

As we know that :

$\implies \bf Radius =\: \dfrac{Diameter}{2}$

$\implies \sf Radius =\: \dfrac{15}{2}$

$\implies \sf\bold{\purple{Radius =\: 7.5\: cm}}$

Hence, the radius of a circle is 7.5 cm .

Now, we have to find the circumference of a circle :

Given :

• Radius = 7.5 cm

According to the question by using the formula we get,

$\implies \sf Circumference_{(Circle)} =\: 2 \times \dfrac{22}{7} \times 7.5$

$\implies \sf Circumference_{(Circle)} =\: \dfrac{44}{7} \times 7.5$

$\implies \sf Circumference_{(Circle)} =\: \dfrac{330}{7}$

$\implies \sf\bold{\red{Circumference_{(Circle)} =\: 47.14\: cm}}$

$\therefore$ The circumference of a circle is 47.14 cm .

Answer 2

Here we are given a circle having a diameter of 15 units

So, radius = 15 / 2

                = 7.5

We have to find the circumference of the circle

Circumference of circle = 2πr

We will put the value of r = 7.5 and π = 22/7

Circumference of circle = 2 × (22/7) × 7.5

                                       = 47.1 ( approx)

So, the circumference of the circle will be approximately 47.1 units.