Foundation November 2018 Paper 3 Q29
29 Use trigonometry to work out the size of angle \(x\). [2 marks]
Not drawn accurately
| Answer | Mark | Comments |
|---|---|---|
| \(\cos x = \dfrac{9}{10}\) | M1 | oe eg \(\sin x = \dfrac{\sqrt{10^2 - 9^2}}{10}\) \(\tan x = \dfrac{\sqrt{10^2 - 9^2}}{9}\) |
| 25.8… or 26 | A1 |
Additional guidance
| \(\cos = \dfrac{9}{10} \quad x = 25.8\) (recovered) | M1A1 |
| \(\cos = \dfrac{9}{10}\) | M0A0 |