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Trigonometric Ratios

Trigonometric Ratios. Using the Calculator…. You will be using the sin , cos , and tan buttons on your calculator. You must have a scientific calculator! You may also need to use the 2 nd button. finding the trig ratio if you know the angle. If you know the angle,

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Trigonometric Ratios

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  1. Trigonometric Ratios

  2. Using the Calculator… • You will be using the sin, cos, and tan buttons on your calculator. You must have a scientific calculator! • You may also need to use the 2nd button.

  3. finding the trig ratio if you know the angle • If you know the angle, press the trig function followed by the angle measure, then press enter. • Round your answers to the nearest hundredth.

  4. Examples • Ex. 1 sin 30° = • Ex. 2 cos 45° = • Ex. 3 tan 120°

  5. Finding the angle if you know the trig ratio • You must press the 2nd button before the trig function! • Then type the ratio and press enter. • The ratio can be a fraction or a decimal. • Round your angles to the nearest degree.

  6. examples • Ex. 4 sin A = 0.5 • Ex. 5 cos B = ½ • Ex. 6 tan C = 0.257

  7. Time for you to practice!

  8. Which trig ratio should I use? • You need to analyze each triangle and determine what information you have been given…

  9. Look at this triangle. Ex. 7

  10. Ex. 8

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