Maths - triangles

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Math

GCSE Mathematics

Edexcel

Last updated 10:50 AM on 1/28/25
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5 Terms

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Pythagoras

a² + b² = c²

2
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Sine rule

A / sin(a) = B / sin(b)

3
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Cosine rule for a side

a² = b² + c² - 2bc cos(A)

4
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Cosine rule for an angle

Cos(A) = b² + c² - a² / 2bc

5
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Area from a triangle

Area = ½ ab sin(C)