Question

find the circumference and area if radius is 7cm

please answer​

Answer 1

Answer:

circumference- 2πr (π = 22/7 or 3.14)

- 2 × 22/7 × 7

- 22 × 2 = 44cm

area-πr²

- 22/7 × 7²

- 22/7 × 49

- 154 cm²

Step-by-step explanation:

heyy bruh! hope you'll be helped by this answer :)

Answer 2

To find : 1) area of circle

             2) circumference of circle

Given : radius = $7 \ cm$

Solution :

• To find area of circle we use following formula :

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

• Substituting the value of $\pi = 3.14$ and $r = 7\ cm$ we find area of circle .

          $Area \ of \ circle = ( 3.14 ) (7 )^{2}$

                                 $= 153.86\ cm^{2}$

• Now, to find area of circumference of circle we have following formula:

          $Circumference \ of \ circle = 2\pi r$

• Substituting values of $\pi = 3.14$ and $r = 7\ cm$  

         $Circumference \ of \ circle = 2 ( 3.14 ) ( 7 \ cm )$  

                                                 $= 43.96\ cm$

Hence, area of circle is $153.86 \ cm^{2}$ and circumference of  circle is $43.96 \ cm$.