Warm Up

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# Warm Up - PowerPoint PPT Presentation

Warm Up. How’d the test go? Better? Worse? Did you do anything different to study for this test? How many times have you attended tutoring? Did you do every homework assignment for the unit?. Circular Trig. Basic Terms. An angle is formed by rotating a ray around its endpoint.

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## PowerPoint Slideshow about ' Warm Up' - perry-emerson

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Presentation Transcript
Warm Up
• How’d the test go? Better? Worse?
• Did you do anything different to study for this test?
• How many times have you attended tutoring?
• Did you do every homework assignment for the unit?

### Circular Trig

Basic Terms
• An angle is formed by rotating a ray around its endpoint.
• The ray in its starting position is called the initial side of the angle.
• The ray’s location after the rotation is the terminal side of the angle.

terminal side

angle

initial side

Basic Terms
• Positive angle: The rotation of the terminal side of an angle counterclockwise.
• Negative angle: The rotation of the terminal side is clockwise.

We don’t have to stop there!

• 137 is coterminal with 497. They have the same terminal angle! We can keep adding or subtracting 360 to get more coterminal angles.

137 more

360

497 altogether!

Example 2: For the angles below, find the smallest positive coterminal angle.

(Add or subtract 360 as may times as needed to obtain an angle with measure greater than 0 but less than 360.)

a) 1115 b) 187

a) 1115° - 360° - 360° - 360° = 35°

b) 187 + 360 = 173