Transcript 8-4 Trigonometry

8-4 TRIGONOMETRY
Ms. Andrejko
Notes/Vocab
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Trigonometry- triangle measure
Trigonometric Ratio- the ratio of the lengths of the
sides of a right triangle
opposite
sin 
hypotenuse
adjacent
cos 
hypotenuse
opposite
tan 
adjacent
SOH – CAH - TOA
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NOTE: If you are trying to get an angle measure as
your answer, you must use sin-1, cos-1, tan-1.
USING THE CALCULATOR!!!
USING THE CALCULATOR!!!
CHECK MODE BEFORE STARTING!!!
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On the calculator type in:
 Sin
 90
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Did you get 1?
Just to get you thinking…

Sin <B =
b
c
a
 Cos <B =
c

Tan <B =
b
a
Examples
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Find sin L, cos L, tan L, sin M, cos M, and tan M. Express each ratio as a fraction
and as a decimal to the nearest hundredth.
Practice
Examples
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Find x. Round to the nearest hundredth.
Practice
Examples
Practice