O-LevelAdditional MathematicsCircular measureMay/June 2025Paper 1 Q108 Marks
The diagram shows the shape OABCDEF. AOF is a straight line. OAB and OEF are sectors of a circle with centre O and radius r. Angle BOA = angle EOF. OCD is a sector of a circle with centre O and radius 4r/3. Angle COD is θ radians. The point B lies on the line OC and the point E lies on the line OD. The line BE is parallel to the line AOF.
📋 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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