Question

What is the perimetre of the sector with radius 10.5 cm and sector angle 60

Answer 1

hi yusuf,

perimeter of sector = 2*radius + length of arc

now
2*radius = 2*10.5 = 21cm

length of arc
= perimeter of circle * Ф/360
= 2πr * 60/360
= 2*22/7*10.5*1/6
= 11 cm

hence
perimeter of sector
= 2*radius + length of arc
= 21 + 11
= 32 cm

so perimeter of given sector  = 32 cm

Hope it helped.
Let me know if any doubts.
Cheers !!!