1MA0 Higher November 2013 Paper 2 Q9

EdexcelHigherOld spec4 marksAngles in Polygons

9 The diagram shows a pattern using four identical rhombuses.

Diagram NOT accurately drawn

Work out the size of the angle marked \(a\).
You must show your working. (4)

Mark scheme

Answer	Mark	Notes
115	4	M1 for \(360 - 4 \times 25\) (=260) M1 (dep) for ‘260’ \(\div 4\) (=65) M1 for 180 − ‘65’ or \((360 - 2 \times\) ‘65’\() \div 2\) A1 for 115 with working OR M1 for \(360 \div 4\) (=90) M1 (dep) for ‘90’ − 25 (=65) M1 for 180 − ‘65’ or \((360 - 2 \times\) ‘65’\() \div 2\) A1 for 115 with working