Question

the circumference of a circle of diameter 7 cm is ​

Answer 1

Correct Question:-

Find the circumference of a circle of diameter 7 cm is ____

Answer:-

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

Step-by-step explanation:

To Find:-

• The circumference ........(?)

Solution:-

Method 1

Given, diameter is 7cm

We know that,

$\boxed{ \sf{circumference \: of \: circle \: if \: diameter}} \\{ \boxed{\sf \: is \: given\: = \pi \: d}}$

Therefore, .....( π = 22/7 )

By putting the values,

$= \dfrac{22}{7} \times 7$

Cancelling 7

= ( 22 × 1 ) cm

Circumference = 22cm

Method 2

Given, diameter is 7cm

Radius = Diameter/2

radius ( r ) = 7/2

We know that,

$\boxed{ \sf{Circumference= 2 \: \pi \: r}}$

By putting the values,

$= 2 \times \dfrac{22}{7} \times \dfrac{7}{2}$

Cancelling 7

$= 2 \times 22 \times \dfrac{1}{2}$

Dividing 22 and 2 with 2

= 2 × 11 cm

Circumference = 22cm

Required Answer:-

The circumference is 22cm.

Answer 2

Answer:

Hence, value of circumference of the circle will be 22 cm

Step-by-step explanation:

In context to question asked,

We have to determine the circumference of circle.

As per data given in the question,

We have,

Diameter of circle = 7 cm

So, value of radius will be 7/2 = 3.5 cm

As we know that,

Circumference of circle is the length of outer border of the circle.

So, we have,

Formula for finding the circumference of circle as,

$Circumference \:C = 2 \Pi r , \\where \:'r' \:is \:the\: radius.$

So, for determining the value of circumference of circle we will put the value of radius in above formula.

Thus we will get.

$C = 2 \Pi r \\C = 2 \times \frac{22}{7} \times 3.5\\=>C = 2 \times 22 \times 0.5 \\=>C = 22\:cm$