Question

what is the perimeter of the sector with radius 21 cm and sector angle 60°??​

Answer 1

perimeter is nothing but arc length, just apply arc length formula

which is ,

$theta \: by \: 360 \times 2 \times \pi \times r$

now substitute theta value which is 60

= 60/360×2×22/7×21

=22cm^2

Answer 2

Hey mate ☺

Radius =21cm

♂ theta=60°

perimeter of sector =

$\frac{angle}{360} \times 2\pi \: r + 2 r \\ \frac{60}{360 } \times {2 \times \frac{22}{7} }{ \times 21} + 2 \times 21\\ = 22 + 42 \\ = 64cm$

Hope it helps you ☺✌✌