1MA0 Foundation November 2013 Paper 2 Q24
24 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)
| Answer | Mark | Notes |
|---|---|---|
| 115 | 4 | M1 for 360 − 4 × 25 (=260) M1 (dep) for “260” ÷ 4 (= 65) M1 for 180 – “65” or (360 − 2 × “65”) ÷ 2 A1 for 115 with working OR M1 for 360 ÷ 4 (= 90) M1 (dep) for “90” − 25 (=65) M1 for 180 – “65” or (360 – 2 × “65”) ÷ 2 A1 for 115 with working |