Question

Find the perimeter and area of sector of circle of radius 7cm and its angle is 120 degree.

Answer 1

Answer:

Radius= 7 centimetre

angle= 120 degree

area of sector= theta/360*pi r²

= 120/ 360*22/7*7*7

= ⅓*22*7 = 154/3cm²

Answer 2

Answer:

Step-by-step explanation:

Radius (r) = 7 cm

Angle(A) = 120

Perimeter = A/360 *2πr + 2*r

                = 1/3 * 2*22/7*7 + 14

                = 44+42/3

                = 86/3 cm

                = 28.67 cm (approx)

Area = A/360 * πr²

        = 1/3 * 22/7 *49

        = 22*7/3

        = 154/3

        = 51.34 cm² (approx)