1MA0 Higher June 2017 Paper 2 Q15
15 \(ABCDEFGHI\) is a regular 9-sided polygon.
Diagram NOT accurately drawn
The vertices \(B\) and \(E\) are joined with a straight line.
Work out the size of angle \(BEF\).
You must show how you get your answer. (4)
| Answer | Mark | Notes |
|---|---|---|
| 100 | 4 | M1 for \(360 \div 9\) (= 40) or \((9 - 2) \times 180\) (= 1260) M1 (dep) for \(180 - \text{``}40\text{''}\) or \(\text{``}1260\text{''} \div 9\) (= 140) oe M1 (dep M2) for a complete method to find the required angle, eg \(\text{``}140\text{''} - (360 - \text{``}140\text{''} - \text{``}140\text{''}) \div 2\) or \((\text{``}140\text{''} \div 7) \times 5\) A1 for 100 supported by working |