2010-II-20
Ans: A
Denote $O$ the centre of the semi-circle and join $OD$
… Read Denote $O$ the centre of the semi-circle and join $OD$
$\begin{array}{rcl}
\tan \alpha
$\be
Note that $y+7=0$ is a horizontal line and $R(-4,-3)$
Note that $\theta = 210^\circ – 180^\circ = 30^
$\begin{array}{cl}
= & \dfrac{x+x
$\begin{array}{cl}
=