0580/21 May/Jun 2023, Question 1: Angles in a Quadrilateral
Cambridge IGCSE Mathematics 0580 · Paper 21 (Extended) · Calculator · 2 marks
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The question, in short
Quadrilateral ABCD has angles ABC = 104°, BAD = 71° and BCD = 56°; CD is extended to E along a straight line. Find angle ADE.
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Solution · 2 marks
- 1Angle ADC = 360 − (56 + 104 + 71) = 360 − 231 = 129° (angles in a quadrilateral)
- 2Angle ADE = 180 − 129 = 51° (angles on a straight line)
Answer51
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