Question

the area of the cicle is 81pi sq.cms. find the length of the arc

Answer 1

$\bold{ To. find. radius. of. solution }$

$\bold{ S = π * r² }$

$\bold{81*π *r² }$

$\bold{ then r = √81 = 9cm }$

$\bold{ the. arc. length. is = r*α }$

$\bold{ 9 * π/ 3 }$

$\bold{ 9 * (3*14) / 3 }$

$\bold{ answer is 3 *3 *14 = 126 m }$