AM-2526

R-formula

A Math · Secondary 4 · Hard · R-formula

The displacement of a particle is given by

s = 9\cos\theta - 12\sin\theta

. It can be written as

s = R\cos(\theta+\alpha)

, where

R>0

and

0^\circ<\alpha<90^\circ

. What is the value of

R

?

$15$
$\sqrt{81}$
$\sqrt{144}$
$\sqrt{2250}$

Sign in to check your answer and see the hint and the worked explanation. Free on PrepLab High.

Loading problem…