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Section 4-1: Right Triangle Trigonometry and Section 4-2: Degrees and RadiansTuesday, November 11th

+Chalk Talk

+A hot air balloon that is moving above a neighborhood has an angle of depression of 28° to one house and 52° to a house down the street. If the height of the balloon is 650 feet, estimate the distance between the two houses.

+The angle of elevation from a car to the top of an apartment building is 48°. If the angle of elevation from another car that is 22 feet directly in front of the first car is 64°, how tall is the building?

+A person standing 100 feet from the bottom of a cliff notices a tower on top of the cliff. The angle of elevation to the top of the cliff is 30°, and the angle of elevation to the top of the tower is 58°. How tall is the tower?

+Degree-Minute-Second (DMS) to Decimal Degree Form

60 minutes in a degree

60 seconds in a minute

56.375°32°56’7’’

+329.125° 35°12’7’’

+Radian Measure

https://www.youtube.com/watch?v=7QhgYX8cRE4

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+To convert a degree measure to radian, multiply by

To convert a radian measure to degree, multiply by

+Convert the degree measure to radians and vice versa.

120°-45°

+Coterminal angles

45°

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-30°