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O-LevelMathematicsGeometry4024/11 · May/June 2017 · Q32 Marks

[Figure 3.1 - A quadrilateral ABCD with AB parallel to DC. Diagonals AC and BD intersect at E. Triangle ADE is right-angled and isosceles with AD = DE. Angle ABD is shown as 25°.] In the diagram AB is parallel to DC. AC and BD intersect at E. Triangle ADE is right-angled and isosceles with AD = DE. ABD = 25°. Find x.

  1. Find x.[2]

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Mark scheme

Marking points from the official mark scheme (May/June 2017). The mark or mark type is shown in brackets.

  1. [2] 20 B1 for 135 seen or ∠BDC=25 or ∠DAE = 45 or ∠DEA = 45

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About this question

Topic
Geometry, O-Level Mathematics (syllabus 4024). Structured question, 2 marks.
Source
O-Level Mathematics, May/June 2017 Paper 1 Variant 1, question 3.

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