Sine Rule and Cosine Rule. Clicker Practice. SOH/CAH/TOA can only be used for rightangled triangles. The Sine Rule can be used for any triangle:. a sin A. b sin B. c sin C. = =. C. b. The sides are labelled to match their opposite angles. a. A. B. c. The Sine Rule:.
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Clicker Practice
The Sine Rule can be used for any triangle:
a
sinA
b
sinB
c
sinC
= =
C
b
The sides are labelled to match their opposite angles
a
A
B
c
The Sine Rule:
We have two angles and a side
OR
We have two sides and the nonincluded angle (this is the ambiguous case)
A
c
b
B
C
a
B
C
(One side)2
=
(other side)2+(last side)2

2(other side)(last side)cos(angle of 1st side)