Question

Find the radius of a circle which subtends an angle of 120° at the centre of the circle and is of length 2.8cm (π = 22/7)

Answer 1

Answer:

r = 9.52 cm

Step-by-step explanation:

length of arc = ∅/360 × πr²

2.8cm = 120/360×(22/7)×r²

2.8 =1/3 (22r²/7)

2.8×21 = 22r²

28/10×21 = 22r²

19×21

√{ _____} = r

22 × 5

r = 9.52 cm

JAI SHREE KRISHNA