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Abbreviations
· O stands for opposite (line opposite the angle)
· A stands for adjacent (line next to the angle)
· H stands for Hypotenuse (longest side)
H Angle
O
Right angle
This is correct in this
A scenario, positions
can change!…read more

Slide 3

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O O
Tan A Sin H
A
Cos H…read more

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Rules
· Angles are always upper case, and Sides
are always lower case.
· Matching angles and sides are always
opposite each other.
· To do any rule you need to know the
values for at least one pair.
· When working out an angle we do the
inverse function e.g. sin…read more

Slide 5

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Sine Rule
Sin A Sin B Sin C
a b c
a
B
C
c
b
A…read more

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Cosine Rule
a² = b² + c² - 2bc cos A
b² = a² + c² - 2ca cos B
c² = b² + a² - 2ba cos C
Re-arranged:
a² + b² - c²
Cos C =
2ba…read more

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