(a(i))[2]
With a straight edge and compasses only, construct the perpendicular bisector of $AB$. Show every construction arc.
(a(ii))[1]
Using only a ruler and compasses, construct the locus of points inside the triangle that are $4$ cm from $C$.
(b)[1]
Shade the part of the triangle that is more than 4 cm from $C$ and nearer to $B$ than to $A$.