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Sine rule, cosine rule and area of a triangle · GCSE Mathematics · Courselo

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GCSE Maths
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Geometry and measures

Sine rule, cosine rule and area of a triangle

Geometry and measures · Lesson 8 of 11

Lesson 8 of 11

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Unit 4

Geometry and measures

11 lessons · 11 h 15 min of study

Angles, parallel lines and polygons1 h of study
Constructions, loci, bearings and scale drawings1 h of study
Transformations55 min of study
Congruence and similarity1 h of study
Perimeter, area, circles, arcs and sectors1 h of study
Volume, surface area and 3D shapes1 h of study
Pythagoras’ theorem and right-angled trigonometry1 h 10 min of study
Sine rule, cosine rule and area of a triangleReading · 0%
Circle theorems1 h of study
Vectors1 h of study
Matrices and matrix transformations (4MB1)1 h of study

This unit is ≈24% of the GCSE Maths, across 11 lessons. Full syllabus

Lesson 8 of 11 · Geometry and measures

Sine rule, cosine rule and area of a triangle

3 quick checks≈3% of the testStretch: Stretch: harder material that separates the top grades

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By the end you’ll be able to

Use the sine rule to find a missing side or angle, and recognise the ambiguous case for an angle (Higher)
Use the cosine rule to find a missing side or angle (Higher)
Calculate the area of a triangle using $\frac{1}{2}ab\sin C$, and use it in reverse to find a side or angle (Higher)

Practice this skill

Adaptive questions on sine rule, cosine rule and area of a triangle.

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0% read

Choose the correct rule in multi-step problems involving bearings, quadrilaterals split into triangles and 3D shapes (Higher)

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PreviousPythagoras’ theorem and right-angled trigonometry Next lessonCircle theorems