Question

find the area of circle if it's diameter is 42 m
take
$\pi = 22 upon 7$
​

Answer 1

$\bold{Given :} \\ \\ = = > Diameter = 42 \: m \\ \\ = = > \pi = \frac{22}{7} \\ \\ \bold{To \: find :} \\ \\ = = > Area \: of \: Circle \\ \\ \bold{Solution :} \\ \\ We \: know \: that , \: area \: of \: circle : \\ \implies \pi r ^{2} \\ \\ \bold{Radius :} \\ \\ = = > \frac{ diameter}{2} \\ \\ = = > \frac{42}{2} \\ \\ = = > \bold{21 \: m} \\ \\ \bold{ Therefore \: area} : \: \\ \\ \implies \: \frac{22}{7} \times 21 \times 21 \\ \\ \implies \: \frac{22}{ \cancel7} \times \cancel{ 21 }\times 21 \\ \\ \implies \: 22 \times 3 \times 21 \\ \\ \implies 66 \times 21 \\ \\ \implies \bold{1386 \: m {}^{2} } \\ \\ Therefore \: area \: of \: circle \: having \: \\ diameter \: 42 \: m \: is \: \bold{1386 \: m {}^{2} }$

Answer 2

Answer:

Area of circle is 1386m^2

Step-by-step explanation:

Question:-

Find the area of circle if it's diameter is 42 m

Given:-

Diameter of circle=42m

To find:-

The area of circle

$\huge\mathbb\pink{Solution:-}$

According to the question it is given that,

Diameter of circle=42m

First we have to find the radius of the circle

Radius=

$\frac{diameter}{2}$

$= \frac{42m}{2}$

$= 21m$

Radius of circle=21m

Next we have to find area of circle, (Taking π=

$\frac{22}{7}$

)

Area of circle=

$\pi \: {r}^{2}$

r=radius

On substituting values we get,

=

$\frac{22}{7} \times 21m \times 21m$

$= \frac{22}{7} \times {441m}^{2}$

On cancelling with 7 we get,

$= \frac{22}{1} \times {63m}^{2}$

$= {1386m}^{2}$

Therefore area of circle is 1386m^2