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3.Trigonometrical Ratios, Functions and Identities
easy
The angle subtended at the centre of a circle of radius $3$ metres by an arc of length $1$ metre is equal to
A
$20°$
B
$60°$
C
$\frac{1}{3}$ radian
D
$3$ radians
Solution
(c) Given that radius $(r) = 3m$ and arc $(d) = 1m$
We know that ${\rm{Angle}} = \frac{{{\rm{arc}}}}{{{\rm{radius}}}} = \frac{1}{3}radian.$
Standard 11
Mathematics