Radius of circle whose arc of length 15,cm makes an angle of 3/4 radian at centre is ..... cm

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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

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