RADIAN THE UNIT CIRCLE. REMEMBER Find the circumference of a circle that has a radius of 1. C = 2πr C = 2π(1) C = 2π.

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Presentation transcript:

RADIAN THE UNIT CIRCLE

REMEMBER Find the circumference of a circle that has a radius of 1. C = 2πr C = 2π(1) C = 2π

RADIANS We can talk about a circle according to it’s central angle: 90° We can talk about a circle according to how much of the circumference the angle involves … OR

CONVERSION How many degrees are in one complete circle? 360° Using π, how much of the circumference is covered in one complete turn? = 2π Which simplifies to

TRY … 1. Convert 30° to radians: 2. Convert to degrees: °