Using ruler and a pair of compasses only,
(a) construct, (i) triangle XYZ with |XY| = 8cm, < YXZ = 60° and < XYZ = 30° ; (ii) the perpendicular ZT to meet XY in T ; (iii) the locus \(l_{1}\) of points equidistant from ZY and XY.
(b) If \(l_{1}\) and ZT intersect at S, measure |ST|.
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