#$8)$ In $3$D$,$ sketch the cylinder $x^2+z^2=4,$ and label, with their coordinates, its intercepts with coordinate a$-$xes.

#$9.$ In $3$D$,$ sketch the circe reprezented by $x^2+z^2=4,y=3,$ label with their coordinates its center and four points on the circle.

$110.$ Find the distance between points $A(-1,2,9)$ and $B(1,-1,3).$

#$11,$ Given $($representatives of$)$ vectors vec$(u),$vec$(v)$ in the plane, as shown, do i$($m$2$D$)$

$($a$)$ sketch the representative of $-2$vec$(v)$ which has its initial point coincide with the terminal point of vec$(u).($b$)$ Sketch and label the vector vec$(u)-2$vec$(v).$

#$12$ Given points $P(-1,5{)}^{In},Q(3,4)$ find the comporents of the vector vec$(V)=$vec$(PQ).$ Sketch $P,Q,$ the vector vec$(V)$ applied at $P,$ and the vector vec$(V)$ in standard position, label approp #$13,$ Given the vector vec$(v)=($:$3,-1$:$)$ apply $2$vec$(V)$ at the point $T(2,4).$ Label the vecto $2$vec$(grad),$ and the of $2v$ endpoint W of this represeritative with its coordinates.

#$14,$ in $2$D$,$ for the point $P(4,-1)$

$=>{?}_x$ sketch P$)$ and sketch and label with its components the corresponding position vector $NF{e}^2($also called radius vector$)$ vec$(r).$