13.1 Right Triangle Trigonometry

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13.1Right TriangleTrigonometry

• The Good Stuff

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Trigonometric Functions
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Pythagorean vs. Trigonometry
c

• a

b
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Using a calculator to find trig values
.2419 .8572 1.6643 1.0864 1.0154 1.3764

• sin14
• cos31
• tan59
• sec23
• csc80
• cot36

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Angle of Elevation vs. Angle of Depression
a
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Application
An airplane is flying at an altitude of 30,000
feet is headed toward an airport. To guide the
airplane to a safe landing, the airports landing
system sends radar signals from the runway to the
airplane at a 10 angle of elevation. How far
away is the airplane (measured along the ground)
from the airport runway?
30,000 ft
10
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Memory work
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Memory work
? sin ? cos ? tan ? csc ? sec ? cot ?
30
45
60