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Introduction
· This Chapter involves the use of 3
formulae you saw at GCSE level
· We will be using these to calculate
missing values in triangles
· We will also see where these formulae
come from…read more

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Slide 4

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The Sine and Cosine Rules
B
Consider the triangle labelled to the right, hyp hyp
remembering GCSE trigonometry: c a
opp
Right hand triangle:
A C
adj b adj
Left hand triangle:
O
The opposite sides are the same so: S H
Divide by c
and a
2A/B…read more

Slide 5

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The Sine and Cosine Rules
Calculate the labelled side in the triangle to
the right:
Have the unknown as
the numerator!
8mm
Substitute
numbers in
82°
Multiply by
x
Sin82
34°
Work out the
fraction
2A/B…read more

Slide 6

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The Sine and Cosine Rules
Calculate the labelled angle in the triangle
to the right:
Have the unknown as
the numerator!
15cm
Substitute
numbers in 32°
Multiply by 12
12cm
Work out the
fraction
Use Inverse
Sine
2A/B…read more

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