Analysis and Approaches for IBDP Maths Ebook 1 | Page 113

Front Page
Chapter
11
2-D Trigonometry
SUMMARY POINTs
� Consider a triangle ABC :
sin sin
1. Sine rule: A B a b
� or �
a b sin A sin B
Note: The ambiguous case exist if two sides and
an angle are known, and the angle is opposite
to the shorter known side
2. Cosine rule:
2 2 2
a b c 2bc cos A
� � � or
1
3. The area of the triangle ABC � absinC
2
b �c �a
cos A �
2bc
2 2 2
11
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