Higher November 2020 Paper 5 Q9
9 In the diagram, AB and DC are parallel lines of equal length.
Not to scale
Prove that angle DAB = angle BCD. [4]
| Answer | Marks | Part marks and guidance | |
|---|---|---|---|
| Angle ABD = Angle CDB (alternate) BD is common oe AB = CD given oe | M3 | M2 for 2 correct statements with reason[s] or 3 correct but no/incorrect reason[s] M1 for 1 correct statement with reason or 2 correct but no/incorrect reasons If 0 scored, SC1 for any attempt to prove congruency | Not alternative angles Accept BD = BD, BD is shared Accept same length oe for ‘given’ eg attempt to list pairs of equal sides or equal angles (2 or more even if incorrect) |
| SAS so triangles are congruent and Angle DAB = angle BCD | A1 | ||