13.1 Right Triangle Trigonometry The Good Stuff

Trigonometric Functions

Pythagorean vs. Trigonometry a θ b c

Using a calculator to find trig values  sin14˚  cos31˚  tan59˚  sec23˚  csc80˚  cot36˚

Angle of Elevation vs. Angle of Depression θ α

Application 10˚ 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 airport’s 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

Memory work

θsin θcos θtan θcsc θsec θcot θ 30˚ 45˚ 60˚