Question

Find the area and circumference of circle whose radius is 28m​

Answer 1

Answer:

area of circle =pie r2

=22/7×28×28

=2464

circumference of circle =2pie r

2×22/7×28

=176

Answer 2

What we have to do ?

As from the above question we come to know that circle have radius 28 m. So, We have to find the area of the circle.

For that, we will use the formula for finding the area of the circle.

Here we get the answer then.

Let's find it :

We have to know -

${\boxed{\bf{Area \: of \: circle = \pi r^{2} }}}$

From Given ::

• Radius - 28 m

• Taking π as 22/7

Now, Substituting the respective values, we get ::

$:\implies\sf \: Area \: of \: circle \: = \pi r^{2}$

$:\implies\sf \: Area \: of \: circle \: = \dfrac{22}{7} \times 28^{2}$

$:\implies\sf \: Area \: of \: circle \: = \dfrac{22}{7} \times 28 \times 28$

$:\implies\sf \: Area \: of \: circle \: \dfrac{22}{\cancel{7}^{ \: \: 1} } \times {\cancel{28}^{ \: \: 4} } \times 28$

$:\implies\sf \: Area \: of \: circle \: = 22 \times 4 \times 28$

$:\implies\sf \: Area \: of \: circle \: = 88 \times 28$

Hence ,

$\dashrightarrow\:\: \underline{ \boxed{\sf The \: Area \: of \: circle = {\red{2464 \: cm^{2} }} }}$

Now, It is also stated that we have to find out the circumference also.

Then,

Formula need to know ::

${\boxed{\bf{Circumference \: of \: circle = 2 \pi r }}}$

From Given ::

• Radius - 28 m

• Taking π as 22/7

Now, Substituting the respective values, we get ::

$:\implies\sf \: Circumference \: of \: circle \: = 2 \pi r$

$:\implies\sf \: Circumference \: of \: circle \: = 2 \times \: \dfrac{22}{7} \times 28$

$:\implies\sf \: Circumference \: of \: circle \: = 2 \times \: \dfrac{22}{\cancel{7}} \times {\not{28}^{ \: \: 4}}$

$:\implies\sf \: Circumference \: of \: circle \: = 2 \times 22 \times 4$

$:\implies\sf \: Circumference \: of \: circle \: = 44 \times 4$

$:\implies\sf \: Circumference \: of \: circle \: = 176 \: cm$

Hence,

$\dashrightarrow\:\: \underline{ \boxed{\sf The \: Circumference \: of \: circle \: {\red{176 \: cm}} }}$

_______________________