2004 年

In the figure, find $AC$ correct to 2 decimal places.

In the figure, $\sin x=$

In the figure, $O$ is the centre of the circle $ABCD$. If $EAB$ and $EDOC$ are straight lines and $EA=AO$, find $\angle AEO$.

In the figure, $O$ is the centre of the circle $ABC$. Find $x$.

In the figure, $ABCD$ is a circle. $AC$ and $BD$ meet at $E$. If $AD=4$, $AE=2$, $EC=5$ and $BE=4$, then $BC=$

In the figure, $ABC$ is a circle. If $\angle ABC=30^\circ$ and $\widehat{AC}=4$, then the circumference of the circle is

In the figure, $ABC$ is a straight line. If $BD /\!/ CE$, then $\angle DCE=$

In the figure, $ABCD$ and $AGFE$ are straight lines. If $BC=2\text{ cm}$, $CD=3\text{ cm}$, $BG=6\text{ cm}$ and $CF=10\text{ cm}$, then $DE=$

If $a>0$, $b>0$ and $c<0$, which of the following may represent the graph of the straight line $ax+by+c=0$ ?

In the figure, $L_1$ and $L_2$ are two straight lines intersecting at a point on the $y$-axis. If the equation of $L_1$ is $x+2y-2=0$, then the equation of $L_2$ is