4400 Higher June 2008 Paper 4 Q15
15
Diagram NOT accurately drawn
Calculate the length of \(AC\).
Give your answer correct to 3 significant figures.
(3)
| Scheme | Marks |
|---|---|
| \(3.1^2 + 3.9^2 - 2 \times 3.1 \times 3.9 \times \cos 80^\circ\) | M1 |
| 9.6 + 15.2 − 4.2 | M1 |
| 4.54 | A1 |
| (3) | |
| (3 marks) |
Notes
M1: \(3.1^2 + 3.9^2 - 24.2 \times \cos 80^\circ\)
M1: or 20.6