O-LevelAdditional MathematicsCircular measureMay/June 2017Paper 1 Q1011 Marks
The diagram shows a circle, centre O, radius 8 cm. The points A, B, C and D lie on the circumference of the circle such that AB is parallel to DC. The length of the arc AD is 4 cm and the length of the chord AB is 15 cm. [Figure 10.1 - A circle with center O and radius 8 cm. Points A, B, C, D are on the circumference. Chord AB is near the top, chord DC is near the bottom, and they are parallel. Arc AD is on the left side, arc BC on the right side. The region between the two parallel chords is shaded.]
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
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