Case study·Standard multi-step (3/5)·No calculator
Difficulty guide
The label describes the problem, not your ability.
1/5 - Foundational
Warm-up setup; checks one basic idea.
2/5 - Routine exam skill
Normal syllabus skill; usually one main rule or interpretation.
3/5 - Standard multi-step
Exam-style problem with multiple steps or a common trap.
4/5 - Hard exam skill
High-end exam problem; combines methods carefully.
5/5 - Challenge
Stretch problem beyond normal exam pressure.
Question
Two triangular braces in a shelf are made as shown. The marked parts of the two triangles match.
Total: 3 marks
(a) Name the congruence rule suggested by the markings. (1 mark)
(b) State one pair of corresponding vertices. (1 mark)
(c) Why are triangles often used in rigid braces? (1 mark)
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