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Do Now. Find the value of each expression. Sin 60 ° Cos 30 ° Tan 270 ° Tan 180 ° Cos 150 °. Chapter 3. Radian Measure & Circular Functions. Section 3.1 – Radian Measure Objective: SWBAT know the definition of radians, convert between degress and radians.

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**Do Now**Find the value of each expression. • Sin 60 ° • Cos 30 ° • Tan 270 ° • Tan 180 ° • Cos 150 °**Chapter 3**Radian Measure & Circular Functions Section 3.1 – Radian Measure Objective: SWBAT know the definition of radians, convert between degress and radians. SWBAT find function values for angles.**Radian Measure**A second way to measure angles is in radians. Definition of Radian: One radian is the measure of a central angle that intercepts arc s equal in length to the radius r of the circle. In general,**Conversions Between Degrees and Radians**• To convert degrees to radians, multiply degrees by • To convert radians to degrees, multiply radians by**Example: Degrees to Radians**• Convert each degree measure to radians. • a) 60**Example: Radians to Degrees**• Convert each radian measure to degrees. • a)**Degrees**Radians Degrees Radians Exact Approximate Exact Approximate 0 0 0 90 1.57 30 .52 180 3.14 45 .79 270 4.71 60 1.05 360 2 6.28 Equivalent Angles in Degrees and Radians**Class work**Convert each degree measure to radians. Leave answers as multiples of pi. • 60 • 90 • 150 • 300 • 450**Convert each radian measure to degrees**• π/3 • 7π/4 • 11π/6 • -π/6 • 7π/10**Homework**• Page 97 # 6-14 even and 22-34 even

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