4MA1/2F Jan 2020, Question 21: Constructing Triangles
Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 2F (Foundation) · Calculator · 2 marks
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The question, in short
Using ruler and compasses, construct the bisector of angle BAC, showing all construction lines.
Summarised in our own words. Use the official paper for the exact wording and the diagram.
Solution · 2 marks
- 1Place compass at point A and draw an arc that intersects AB and AC.
- 2From each intersection point on AB and AC, draw arcs inside the angle that intersect each other.
- 3Draw a straight line from A through the intersection of the two arcs.
- 4This line is the angle bisector of angle BAC, with all construction arcs visible.
AnswerAn arc from A crossing AB and AC, then an arc from each crossing point meeting inside the angle, with a line drawn from A through that meeting point
Stuck on a step? Read the free lesson: Constructing Triangles
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