Foundation November 2019 Paper 1 Q22
22 In a right-angled triangle
smallest angle : largest angle = 2 : 5
Work out the three angles of the triangle. [4 marks]
| Answer | Mark | Comments |
|---|---|---|
| \(90 \div 5\) or 18 | M1 | |
| \(2 \times\) their 18 or 36 | M1dep | M2 \(\dfrac{2}{5} \times 90\) |
| \(180 - 90 -\) their 36 | M1dep | oe eg \(90 -\) their 36 |
| 90 36 54 | A1 | any order |
Additional guidance
| Beware of incorrect methods, eg dividing 180 by 5 \(180 \div 5 = 36\) \(180 \div 2 = 90\) \(180 - 90 - 36 = 54\) Answer 90, 36, 54 | M0M0M0A0 |
| Beware of 18 coming from wrong working \(90 \div 2 = 45\) \(90 \div 5 = 18\) \(90 \div 7 = \ldots\) However, it is not incorrect to work with \(180 \div 10\) | M0M0M0A0 |
| Trial and Improvement scores 0 or 4 |