alleryIn a circle of radius $r$, an arc of length $l$ subtends an angle $\theta$ radian at the centre. The relation is:
A$l = r/\theta$
B$l = \theta/r$
C$l = r\theta$
D$l = r^{2}\theta$
Answer & Solution
Correct answer: C. $l = r\theta$
Arc length = radius × central angle in radians: $l = r\theta$.
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