Question

the radius of a circle is 3 cm. what is the circumference of another circle whose area is 49 times that of the first circle ?​

Answer 1

Answer:

Given the radius of circle is =3 cm

so, it area=$\pi 3^{2}$

               =9$\pi$$cm^{2}$

let the radius of new circle be =x cm. So ,its area = $\pi x^{2}$

                 and its given area is = 49*9$\pi cm^{2}$

              A\Q

                 $\pi x^{2}$=49*9$\pi cm^{2}$

                 $x^{2}$=49*9

                  $x$=$\sqrt{49*9}$

                    $x$ = 7*3

                      $x$=21

      The radius of new circle is 21 cm

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