**(a)** A parabola has 20mm between its focus and
vertex. Locate the directrix and draw a portion of the
curve.

**(b)** Shown is the directrix DD1 of a hyperbola.
Two points, P and Q on the curve are also shown. F indicates
the approximate position of the focus.

The eccentricity of the curve is 1.5

Locate the focus and vertex of the hyperbola.

Draw a portion of the curve which passes through the given
points P and Q.