Describe the method for drawing an ellipse and explain the foci of an ellipse,midpoint,and semi-major axis.

(N/A) $1$. Select two points $F_{1}$ and $F_{2}$.
$2$. Fix the ends of a string at $F_{1}$ and $F_{2}$.
$3$. Using the tip of a pencil,stretch the string taut and draw a curve by moving the pencil while keeping the string taut throughout the motion.
$4$. The resulting closed curve is called an ellipse.
$5$. For any point $T$ on the ellipse,the sum of the distances from $F_{1}$ and $F_{2}$ is constant. The points $F_{1}$ and $F_{2}$ are called the foci.
$6$. Join the points $F_{1}$ and $F_{2}$ and extend the line to intersect the ellipse at points $P$ and $A$. The midpoint of the line segment $PA$ is the centre of the ellipse,denoted by $O$.
$7$. The length $PO = AO$ is called the semi-major axis of the ellipse.