ā Wrong: Co-interior angles are equal
ā Right: Co-interior angles ADD to 180Ā° (they're supplementary)
ā Wrong: Forgetting to check if lines are actually parallel
ā Right: These rules ONLY work for parallel lines
ā Wrong: Not giving a reason in the answer
ā Right: State "corresponding/alternate/co-interior angles on parallel lines"
This study notes covers Common Mistakes within Angles in Parallel Lines for GCSE Mathematics. Revise Angles in Parallel Lines in Geometry & Measures for GCSE Mathematics with 12 exam-style questions and 3 flashcards. Use this page as part of a wider topic revision path rather than treating it as an isolated fact. It is section 7 of 9 in this topic. Use this study notes to connect the idea to the wider topic before moving on to questions and flashcards.
Practice questions for Angles in Parallel Lines
Two parallel lines are cut by a transversal. Which statement about alternate angles is correct?
State the THREE angle rules that apply when a transversal crosses two parallel lines. For each rule, state whether the angles are equal or supplementary.
Quick recall flashcards
Alternate Angles
Z-shape on parallel lines, equal
Co-interior Angles
C-shape on parallel lines, add to 180Ā°