O-LevelMathematicsGeometry4024/12 · May/June 2020 · Q124 Marks
Use a straight edge and compasses only in this question.
- (a)(i)Construct the locus of points inside triangle ABC that are 5 cm from B,[1]
- (a)(ii)equidistant from A and C.[2]
- (b)Shade the region inside triangle ABC containing the points that are • less than 5 cm from B and • closer to A than to C.[1]
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Mark scheme
Marking points from the official mark scheme (May/June 2020). The mark or mark type is shown in brackets.
- [1] Arc, centre B radius 5 cm
- [2] Acceptable bisector of AC with correct arcs
- B1 for acceptable bisector with no/incorrect arcs
- [1] Correct region shaded
- FT their arc centre B and their perpendicular bisector
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