ZIMSEC O-Level Mathematics
10.2Trigonometrical ratios
Trigonometrical ratios in ZIMSEC O-Level Mathematics: what the syllabus expects you to know, the learning objectives and how to practise.
Subtopic88 practice questions4 lessons
Learning objectives
What the syllabus expects you to be able to do.
- 10.2.1Use sine, cosine and tangent to find sides and angles of right-angled triangles.
- 10.2.2Use the sine, cosine and tangent of obtuse angles.
- 10.2.3Use the sine rule and the cosine rule to solve triangles.
- 10.2.4Use the formula area = ½ab sin C to find the area of a triangle.
- 10.2.5Solve three-dimensional problems, including finding the angle between a line and a plane.
Lessons
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Sine and cosine rules
30 min
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Trigonometric ratios of obtuse angles
20 min
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Trigonometry in right-angled triangles
25 min
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Trigonometry in three dimensions
30 min
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Sample question
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