Question

find the circumference of a circle whose radius is 28 cm

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Answer 1

The Required Answer is as follows ;

$\textrm{Circumference of Circle = 2 \pi r}$

$\implies\textrm{Circumference of Circle = 2 \times\:\pi\:\times r}$

$\implies\textrm{Circumference of Circle = 2 \times 22/7 \times 28 cm }$

$\implies\textrm{Circumference of Circle = 2 \times 22 \times 4 cm }$

$\implies\textrm{Circumference of Circle = 176 cm }$

Answer 2

Answer:

The circumference of the circle is $176$ cm.  

Step-by-step explanation:  

In context to the question asked,    

We have to find the circumference of a circle,  

As per data given in the question,    

We have,  

Radius ( r ) = $28$ cm  

For calculating the circumference of the circle,  

The formula to be used,  

Circumference of circle = $2\pi r$  

By substituting the values in the above formula,  

$=> 2\times \frac{22}{7}\times 28$

Now, expressing $(2\times \frac{22}{7})$ as a single fraction

$=> \frac{2\times 22}{7}\times 28$

Multiply $2$ and $22$ to get $44$,

$=> \frac{44}{7}\times 28$

Expressing $(\frac{44}{7}\times 28)$ as a single fraction

$=> \frac{44\times 28}{7}$

Multiply $44$ and $49$ to get $1232$,

$=> \frac{1232}{7}$

Divide $1232$ by $7$ to get $176$,

$=>176cm$  

Hence circumference of the circle is $176$ cm.