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Pre-Calculus/Trig 3 Radian and Degree Measure Name __________________________________ Trigonometry Angle Positive Angle Angle in standard position Negative Angle Coterminal Angles * to find coterminal angles always add or subtract ______ if in degrees or _____ if in radians Measures of Angles Angles are measure in either ________________ or ___________________ Conversions 360o is the same as ______ radians Converting from degrees to radians… 1. 210o = 2. –315o = 2 radians is the same as ______ degrees Converting from radians to degrees… 3. 6 4. 2.5 = Applications Arc Length Examples: 1. Find the length of the arc of a circle whose radius is 5 cm and whose central angle is . 3 2. Find the radius of a circle whose arc length is 20 inches and whose central angle is 120 . Area of a Sector Example: 1. Find the area of the sector in example one from above. 2. Find the area of the sector in example two from above.