(a(i))[2]
With ruler and compasses only, construct triangle $RST$. Keep the construction arcs on your drawing.
(a(ii))[1]
Measure the distance from $S$ to the midpoint of $RT$. Write your answer in millimetres.
(b)[2]
Calculate the real distance between town $A$ and town $B$. Give your answer in kilometres.
(c)[2]
Find the value of $x$.
(d)[3]
Show that, correct to 2 significant figures, $BC$ is 7.5 cm.