4024/11 May/Jun 2021, Question 5: Angles in a Quadrilateral
Cambridge O Level Mathematics 4024 · Paper 11 (Non-calculator) · Non-calculator · 2 marks
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The question, in short
Quadrilateral ABCD has AD extended to E, with angles BCD = 135°, BAD = 83° and CDE = 122°; find x, the angle at B.
Summarised in our own words. Use the official paper for the exact wording and the diagram.
Solution · 2 marks
- 1Angle CDA = 180 − 122 = 58° (angles on a straight line)
- 2x = 360 − 135 − 83 − 58 (angles in a quadrilateral)
- 3x = 84
Answer84
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