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Unit Circle

( 1 , √3 ) 2 2. ( √2 , √2 ) 2 2. 60˚. 45˚. ( √3 , 1 ) 2 2. 30˚. Unit Circle. Use the Unit Circle to find cos 135. Reference angle: 45 Coordinate: x Sign: - Answer: -√2 2. Use the Unit Circle to find sin 315.

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Unit Circle

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  1. ( 1 , √3 ) 2 2 ( √2 , √2 ) 2 2 60˚ 45˚ ( √3 , 1 ) 2 2 30˚ Unit Circle

  2. Use the Unit Circle to find cos 135 Reference angle: 45 Coordinate: x Sign: - Answer: -√2 2

  3. Use the Unit Circle to find sin 315 Reference angle: 45 Coordinate: y Sign: - Answer: -√2 2

  4. Use the Unit Circle to find sin 180 Reference angle: none Coordinate: y Sign: N/A Answer: 0

  5. Use the Unit Circle to find cos 210 Reference angle: 30 Coordinate: x Sign: - Answer: -√3 2

  6. Use the Unit Circle to find tan 225 Reference angle: 45 Coordinate: y/x Sign: -/- = + Answer: 1

  7. Use the Unit Circle to find sin 120 Reference angle: 60 Coordinate: y Sign: + Answer: √3 2

  8. Use the Unit Circle to find cos 120 Reference angle: 60 Coordinate: x Sign: - Answer: -1 2

  9. Use the Unit Circle to find tan 270 Reference angle: none Coordinate: y/x Sign: N/A Answer: 1 = undefined 0

  10. Use the Unit Circle to find tan 360 Reference angle: none Coordinate: y/x Sign: N/A Answer: 0 = 0 1

  11. Use the Unit Circle to find cos 90 Reference angle: none Coordinate: x Sign: N/A Answer: 0

  12. Use the Unit Circle to find cos 150 Reference angle: 30 Coordinate: x Sign: - Answer: -√3 2

  13. Use the Unit Circle to find cos 330 Reference angle: 30 Coordinate: x Sign: + Answer: √3 2

  14. Use the Unit Circle to find cos 240 Reference angle: 60 Coordinate: x Sign: - Answer: -1 2

  15. Use the Unit Circle to find tan 180 Reference angle: none Coordinate: y/x Sign: N/A Answer: 0 = 0 1

  16. Use the Unit Circle to find tan 135 Reference angle: 45 Coordinate: y/x Sign: +/- = - Answer: -1

  17. Use the Unit Circle to find tan 135 Reference angle: 45 Coordinate: y/x Sign: +/- = - Answer: -1

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