Question 4:
Find the degree measure of the angle subtended at the centre of a circle of radius 100 cm by an arc of length 22 cm(Use π = 22/7).
Answer
We know that in a circle of radius r unit, if an arc of length l unit subtends an angle θ radian at the centre, then
θ = 1/r
Therefore, forr = 100 cm, l = 22 cm, we have
Thus, the required angle is 12°36′.
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