Higher June 2023 Paper 6 Q5
5 The diagram represents a coastline.
A, B and C are lighthouses.
A boat is
- the same distance from A and B
- the same distance from AB and BC.
Label the position of the boat clearly. [5]
| Answer | Marks | Part marks and guidance | |
|---|---|---|---|
| Accurate ruled perpendicular bisector of AB with two correct pairs of supporting arcs | 2 | B1 for accurate ruled bisector perpendicular bisector of AB with no or incorrect arcs | Use overlay as a guide Put ruler on screen to check 2 cm if needed Tolerance ±2 mm and ±2°. Line length at least 2 cm Bisector crosses between circles of overlay but does not cut them and perpendicular by eye |
| Accurate ruled bisector of angle ABC with two correct pairs of supporting arcs | 2 | B1 for accurate ruled bisector of angle ABC with no or incorrect arcs | Tolerance ±2°. Line length at least 2 cm Bisector between or on red lines of overlay arcs |
| Correct position of boat clearly identified at point of intersection of two straight lines | 1 dep | Dep on at least B1 and B1 | |