Higher November 2021 Paper 1 Q29
29 Here is triangle \(ABC\) on a grid.
Describe a single transformation of the triangle so that
point \(B\) is invariant
point \(A\) moves to (1, 1)
point \(C\) moves to (1, −1)
[3 marks]
| Answer | Mark | Comments |
|---|---|---|
| Alternative method 1 | ||
| Rotation, 180°, (about) (−1, 1) | B3 | B2 rotation, 180° or rotation (about) (−1, 1) or turn, 180° (about) (−1, 1) B1 rotation or turn, 180° or turn (about) (−1, 1) |
| Alternative method 2 | ||
| Enlargement, scale factor −1 (with centre) (−1, 1) | B3 | B2 enlargement, scale factor −1 B1 enlargement (with centre) (−1, 1) |
| Alternative method 3 | ||
| Reflection in (−1, 1) | B3 | there are no part marks in this method |
Additional guidance
| Allow \(B\) instead of (−1, 1) throughout | |
| Compound transformation | B0 |