This study notes covers Common Mistakes within Properties of Triangles for GCSE Mathematics. Revise Properties of Triangles in Geometry & Measures for GCSE Mathematics with 12 exam-style questions and 3 flashcards. This topic appears less often, but it can still be a useful differentiator on mixed-topic papers. It is section 7 of 8 in this topic. Use this study notes to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 7 of 8
Practice
12 questions
Recall
3 flashcards
Common Mistakes
✗ Wrong: Assuming all isosceles triangles have angles of 45°, 45°, 90°
✓ Right: Isosceles just means 2 equal sides/angles - the actual angles vary
✗ Wrong: Exterior angle = 180° − interior angle at same vertex
✓ Right: That IS true, but the quicker method is: exterior = sum of OTHER two interior angles