2013-II-41
Ans: D
Join $BC$.
… Read Join $BC$.
$\begin{array}{rcl}
\angle BAC & = &
HKDSE-MATH - 2013 - Paper 2
2013-II-42
Ans: B
$\left\{ \begin{array}{ll}
x^2+y^2+2x-2y-7=0 �
… Read $\left\{ \begin{array}{ll}
x^2+y^2+2x-2y-7=0 �
2013-II-43
Ans: A
Note that the perpendicular bisector of $OA$ is $y=6$
… Read Note that the perpendicular bisector of $OA$ is $y=6$
2013-II-44
Ans: C
The number of different numbers
… Read The number of different numbers
$\begin{array}{cl}
2013-II-45
Ans: C
Let $\overline{x}$ be the mean of the five numbers $x_
… Read Let $\overline{x}$ be the mean of the five numbers $x_