Question

find the perimeter of a sector of a circle if its measure is 90 degree and radius is 7 cm ans is 25 cm but how is come plz tell me​

Answer 1

Answer:

ans- 25cm

Step-by-step explanation

For a given sector, r=7cm theta=90

Length of the arc (l) = theta/360 *2pi*r  (formula)

                                = 90/360 x 2 x 22/7 x 7 (substituting in formula)

                          thus l = 11 cm (by calculating)

Perimeter of a sector = l + r + r

                                    = 11+7+7

                                    = 25cm

so u basically use length of arc formula to find L and then find the perimeter

hope this helped!

if any doubts, kindly ask.