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# Pc 4.1 notes

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### Pc 4.1 notes

1. 1. 4.1 Radian and DegreeMeasuresEssential Question:What is a "radian" and how do you convert to and fromradians? 1
2. 2. Warm-up:Classify the following angles:How many degrees in a full circle?Find the circumference of the circle below. 2
3. 3. 4.1 Radian and Degree MeasureParts of every angle: ­Initial Side (ray) ­Terminal Side (ray) ­Vertex Standard Position: ­Initial side on the _______ ­Vertex on the _______+ angles: ________– angles: ________ 3
4. 4. Coterminal Angles: Angles that have the same ________ and ________ sides. Naming an angle: 4
5. 5. Radians Video A radian is the measure of a central angle  that intercepts an arc equal in length to the  radius of the circle.How many radians in 1full circle? 5
6. 6. The Ratio:Ex. 1) Convert the following to degrees or radians.a) 135° b) 320°c)–5π/3 d) π/6 6