Trigonometry Mistake Finder
Find whether your trig weak spot is labelling, formula choice, diagrams, bearings, or calculator control.
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Before you start
What this Mistake Finder checks
Trigonometry errors rarely come from pressing the wrong calculator button alone. They often begin earlier: reading a diagram, deciding which triangle matters, or matching the known sides and angle to a suitable relationship. This Mistake Finder checks the decisions that make trig methods reliable in O-Level G3 Math questions.
It covers the reasoning habits that connect right-angled trigonometry, non-right-angled triangles, bearings, and three-dimensional diagrams. The page does not reveal question answers or post-result explanations. Its role is to help you understand what the Finder can identify before you start.
Common mistake patterns
- Labelling opposite, adjacent, and hypotenuse inconsistently
- Choosing a trig ratio that does not match the known information
- Confusing when sine or cosine rule is appropriate
- Misreading bearings, diagrams, or the triangle needed in a 3D setup
How it works
Answer 8 short questions and Mentora marks them automatically. Your score, full breakdown, correct answers, explanations, mistake-pattern diagnosis, repair guidance and topic-specific 7-day repair plan appear immediately.
Because the questions are short, this is a focused starting point rather than a replacement for your full revision. It is most useful when you want evidence for what to practise next, instead of choosing a topic only because it felt difficult in the last paper.
Who it is for
It is for Singapore Secondary students taking O-Level G3 Math who have practised trigonometry but still find that diagram-heavy questions expose recurring method mistakes. Take it before deciding whether your next revision should focus on ratios, rules, bearings, or 3D triangles.
What happens after
The result is designed to separate isolated slips from repeated trigonometry patterns and broader method issues. That distinction makes it easier to choose a useful revision focus instead of simply redoing a mixed worksheet.
Use that picture to plan a smaller, more specific revision session. A student does not need to treat every topic as equally weak: targeted practice is easier to review, and it gives you a clearer way to check whether the same method mistake has stopped recurring.