HKDSE-MATH - 2012PP - Paper 2 -

Ans: (a) $(6,17)$ (b) (i) $25$ (ii) (1) Collinear (2) $3:2$

1. $

Ans: D
Note that the general form of $C$ is $x^2+y^2-2x+4y-\

Ans: B
$\left\{ \begin{array}{ll}
x^2+y^2+2x-2y-7=0 �

Ans: A
The coordinates of the centre of the circle

$\begin{a

Ans: C
$\left\{ \begin{array}{ll}
x-y=k & \ldots \un

Ans: (a) (i) $3x-4y+59=0$ (b) $50$

1. 1. The mid-point of $PQ$

      $\b

Ans: C
The radius of $C$

$\begin{array}{cl}
= & 0-(-4)

Ans: B
$\left\{ \begin{array}{ll}
x^2 +y^2+2x-6y+k=0 �

Ans: (b) (i) $x^2+y^2-112x+66y=0$ (ii) Yes

1. Note that $P$, $

Ans: C
Note that the equation of $C$ in general form is $x^2 + y

Ans: C
$\left\{ \begin{array}{ll}
x^2 +y^2 -8y-14=0 &

Ans: (a) $(x-2)^2+(y+1)^2=100$ (c) (i) $F$, $G$ and $H$ are

Ans: A
I is true. Note that the centre of $C_1$ is

$\begin{arr

Ans: B
Note that $A$ and $B$ are points lying on the circle. Th

Ans: (a) $C: (x – 8)^2 + (y – 2)^2 = r^2$, $r^2 = \d

Ans: C
A is not true. Sub. $(0, 0)$ into the left side of the equ

Ans: B
I is not true. Rewrite the equation of $C$ to general fo

Ans: A
$\left\{ \begin{array}{ll}
3x – y – 2 =0