(a(i))[2]
Construct the line that bisects angle $BAD$.
(a(ii))[1]
Shade the part of the rectangle that lies nearer to $AB$ than to $AD$.
(b(i))[2]
Construct the perpendicular bisector of segment $GH$.
(b(ii))[1]
Shade the part of the triangle that is nearer to $G$ than to $H$.
(b(iii))[1]
Measure the reflex angle at point $H$.
(c)[3]
Shade the part inside the circle that is more than 5 cm from $M$ and less than 4 cm from $N$.