13'1 Right Triangle Trigonometry

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13.1 Right Triangle Trigonometry
hyp
opp
adj
Angle ?
Right angle 90

• Adjacent is the side that is touching angle ?.
• Opposite is the side that does not touch ?.
• Hypotenuse is the diagonal touching ?.

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Example 1
Evaluate the six trig functions from the given
information. Solution Find h. Then use
definitions.
hyp
4
?
3
3
Special Triangle 45-45-90
45
Sqrt(2)
1
45
1
Note Sin and Cos are simplified since it is not
proper to leave a radical in the denominator.
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Special Triangle 30-60-90
30
2
Sqrt(3)
60
1
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Trig Identities

• Trig identities are relationships between trig
  functions.

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Example 2
1
0.6
?
x