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You use trig ratios and Pythagoras to find missing sides and angles in right-angled triangles. This helps you solve geometry questions accurately in class work and examination settings.
You should already be able to square numbers, find square roots, and recognise a right angle in a triangle. It also helps if you know simple fraction division.
One question from this skill's own question bank, shown with its full working.
In a right-angled triangle, cos of an angle equals:
Working: By SOH-CAH-TOA, cos = adjacent ÷ hypotenuse.
This topic is usually taught in SHS 1 to SHS 3 when learners meet right-angled triangles and basic trigonometric ratios. It also supports the kind of structured problem-solving often assessed in WASSCE.
Curriculum notes are a general guide to where this work normally sits. Always check the syllabus your school or examination body is currently using.
Other SHS Core: Trigonometry, Statistics & Probability skills in Maths, at the same point in the course.
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6 questions with a worked answer after every attempt, and a SmartScore that tracks how close you are to mastery.