2011-II-21
Ans: D
Let $r$ be the length of the hypotenuse.
… Read Let $r$ be the length of the hypotenuse.
By Pythagorus
HKCEE - 2011 - Paper 2
2011-II-22
Ans: C
In $\Delta ABD$,
… Read In $\Delta ABD$,
$\begin{array}{rcl}
\sin 40^\circ
2011-II-23
Ans: B
In $\Delta ACD$,
… Read In $\Delta ACD$,
$\begin{array}{rcl}
\because AD &#
2011-II-24
Ans: C
Note that the projection of $EB$ on the plane $ABCD$ is
… Read Note that the projection of $EB$ on the plane $ABCD$ is
2011-II-25
Ans: A
A is the image rotating the given figure anticlockwis
… Read A is the image rotating the given figure anticlockwis
2011-II-26
Ans: A
The 2 axes of reflectional symmetry are shown in the fo
… Read The 2 axes of reflectional symmetry are shown in the fo
2011-II-27
Ans: C
In $\Delta CDE$, since $CE=DE$, we have
… Read In $\Delta CDE$, since $CE=DE$, we have
$\begin{arra
2011-II-28
Ans: C
Note that the sum of all exterior angles of a regular $n
… Read Note that the sum of all exterior angles of a regular $n
2011-II-29
Ans: B
Note that the coordinates of $B$ are $(-3,-5)$. Since
… Read Note that the coordinates of $B$ are $(-3,-5)$. Since
2011-II-30
Ans: D
Let $(x,y)$ be the rectangular coordinates of $P$.
… Read Let $(x,y)$ be the rectangular coordinates of $P$.
$\
2011-II-31
Ans: D
Note that the slope of the straight line $x+3y-211=0$
… Read Note that the slope of the straight line $x+3y-211=0$
2011-II-32
Ans: D
Note that the slope of $ax+y=1$ is $-a$ and the slope of
… Read Note that the slope of $ax+y=1$ is $-a$ and the slope of
2011-II-33
Ans: A
The required probability
… Read The required probability
$\begin{array}{cl}
=
2011-II-34
Ans: B
Consider the mean of the weights of the seven boys, we h
… Read Consider the mean of the weights of the seven boys, we h
2011-II-35
Ans: D
… Read To draw a box-and-whisker diagram, we only consider t
2011-II-36
Ans: D
Consider the range, we have
… Read Consider the range, we have
$\begin{array}{rcl}
61 &
2011-II-37
Ans: D
Consider the general case $y=f(x+h)+k$.
… Read Consider the general case $y=f(x+h)+k$.
For $k$ is po
2011-II-38
Ans: B
Since $R$ is the $y$ intercept of the graph, then the $x
… Read Since $R$ is the $y$ intercept of the graph, then the $x
2011-II-39
Ans: C
Consider the option A,
… Read Consider the option A,
$\begin{array}{cl}
& \l
2011-II-40
Ans: D
Since $f(x)$ is divisible by $2x+1$, then by the facto
… Read Since $f(x)$ is divisible by $2x+1$, then by the facto