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Mensuration and Trigonometry
Quick questions on Trigonometric ratios in right-angled triangles explained: O-Level E-Maths
5short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is choosing the right ratio?Show answer
Identify which two sides are involved (one known, one wanted), then pick the ratio that uses exactly those two sides. If the hypotenuse and opposite appear, use sine; adjacent and hypotenuse, cosine; opposite and adjacent, tangent.
What is calculator in the wrong mode?Show answer
O-Level trigonometry uses degrees, so the calculator must be in degree mode, not radians.
What is q1?Show answer
In a right-angled triangle the adjacent side is and the angle is . Find the hypotenuse, to 2 decimal places. [2 marks]
What is q2?Show answer
The opposite side is and the hypotenuse is . Find the angle, to 1 decimal place. [2 marks]
What is q3?Show answer
State which ratio links the opposite side and the adjacent side. [1 mark]
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