Trigonometry Section 4.3
Right Triangle Trigonometry
Special Right Triangles
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A unit circle has a radius of _____.
The hypotenuse is _____ of a triangle.
The hypotenuse of the triangles inside the unit
circle has a length of _____.
Special triangle 30-60-90
Special triangle 45-45-90
Fill in the unit circle.
SOHCAHTOA
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SOHCAHTOA is an acronym to help us
remember the right triangle definitions.
S stands for _____.
C stands for _____.
T stands for _____.
O stands for _____.
A stands for _____.
H stands for _____.
Right Triangle Definitions of Trig
Functions
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Therefore, SOH means _____.
CAH means _____.
TOA means _____.
Adjacent and opposite are terms relative to the
_____.
Sine, cosine, and tangent are ratios of triangles.
So why are sine and cosine always between -1
and 1?
Evaluating Trig Functions
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Ex 1
Memorize all identities
Reciprocal identities
Quotient identities
Pythagorean identities
Ex 4
Ex 5
Ex 7
Homework
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Worksheets 3 & 4
1-60, Applications 61-66