9. The scale diagram below shows a railway station P and two hilltops, A and B. Two new stations are to be built at R and S.
(a) Station R is to be
no more than 6 km from P and
the same distance away from A as it is from B.
Using a ruler and a pair of compasses, show accurately on the diagram all the positions where station R may be built.
Scale: 1 cm represents 1 km. [4]
On screen this diagram may not be shown at actual size. To measure it, use the question paper (PDF) printed at 100%.
(b) A train travelling between station R and station S will always be the same distance away from A as it is from B. When the train arrives at station S, it will be as near as possible to hilltop A.
Mark the position of station S on the diagram in part (a). [1]
Mark scheme (a)
Scheme
Marks
Comments
Arc, centre P, radius 6 cm
B1
Allow ±2mm
Correct perpendicular bisector of AB with appropriate arcs
B2
B1 for correct arcs
NB No arcs, no marks; if two full arcs used there must be daylight between the overlapping sections Tolerance ±2°
Correct line segment indicated
B1
FT provided at least the first B1 awarded and a perpendicular bisector attempted (may not have arcs)
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