Question

find the length of an arc of a circle of radius 5.6 cm which subtends an angle of 60 degrees at the centre of the circle.(take pie as 22 divided by 7.)

Answer 1

arc = rØ, where Ø is the central angle in radians, so

arc = 5.6(π/3) = appr 5.86 cm

or

use a ratio:
circumference = 2πr = 11.2π

arc/11.2π = 60/360
arc = 11.2π(1/6) = 5.6π/3 = appr 5.86 cm

btw, with every calculator these days having a π key, nobody uses 22/7 or π anymore.
How old is your textbook?

Answer 2

this text book doesn't explain what the question is all about