4MA0 Foundation January 2016 Paper 1 Q21
21
Diagram NOT accurately drawn
Work out the size of angle ACB.
Give your answer correct to 1 decimal place.
(3)
| Scheme | Marks |
|---|---|
| \(\tan ACB = \dfrac{4.5}{9.6}\) | M1 |
| \(\tan^{-1}\left(\dfrac{4.5}{9.6}\right)\) | M1 |
| 25.1 | A1 |
| (3) |
Notes
M1: for correct trig statement
eg. \(\sin ACB = \dfrac{4.5}{\sqrt{112.41}}\) or \(\cos ACB = \dfrac{9.6}{\sqrt{112.41}}\)
M1: dep
A1: awrt 25.1