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AS Core Maths 2 Revision

Core 2 Chapter 2
The sine and cosine rule

Key points to remember
The sine rule is:

(a ÷ sinA) = (b ÷ sinB) = (c ÷ sinC) OR...
(sinA ÷ a) = (sinB ÷ B) = (sinC ÷ c)

N.B These should all be…

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or b2 = a2 + c2 - 2ac cos B

or c2 = a2 + b2 - 2abcos C

You can use the cosine rule to find an unknown side in a
triangle
if you know the lengths of two sides and the angle between
them

You can use the…

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