Right Triangle Trigonometry

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7.2 Right Triangle Trigonometry
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A triangle in which one angle is a right angle is
called a right triangle. The side opposite the
right angle is called the hypotenuse, and the
remaining two sides are called the legs of the
triangle.
c
b
a
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Terminal side
Initial side
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c
b
a
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The six ratios of a right triangle are called
trigonometric functions of acute angles and are
defined as follows
Function name
Abbreviation
Value
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Find the value of each of the six trigonometric
functions of the angle
c Hypotenuse 13
b Opposite 12
13
12
Adjacent
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Reciprocal Identities
Quotient Identities
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c
b
a
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12
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Theorem Complementary Angles
Theorem
Co-functions of complementary angles are equal.
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