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3.Trigonometrical Ratios, Functions and Identities
easy
The radius of the circle whose arc of length $15\,cm$ makes an angle of $3/4$ radian at the centre is .....$cm$
A
$10$
B
$20$
C
$11\frac{1}{4}$
D
$22\frac{1}{2}$
Solution
(b) Angle $ = \frac{{{\rm{arc}}}}{{{\rm{radius}}}} = \frac{{15}}{{(3/4)}}\,cm$
==> Radius $= 20\, cm.$
Standard 11
Mathematics