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Trigonometric Ratios

Trigonometric Ratios. Math 2Y. Trigonometric ratios. Trig ratio- ratio of the lengths of two sides of a right Δ Always round to four decimal places. 3 basic trig ratios. Sine (sin) sin  Cosine (cos) c os  Tangent (tan) t an . Just remember Chief…. SOHCAHTOA. os is. pp over.

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Trigonometric Ratios

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  1. Trigonometric Ratios Math 2Y

  2. Trigonometric ratios • Trig ratio- ratio of the lengths of two sides of a right Δ • Always round to four decimal places

  3. 3 basic trig ratios • Sine (sin) sin  • Cosine (cos) cos  • Tangent (tan) tan 

  4. Just remember Chief… SOHCAHTOA os is pp over an is in is ypot dj over ypot pp over dj

  5. Ratios of s A and B A B A c b B C a

  6. Ex: Find sin, cos, & tan of A & B. A sin A= 12/13 = .9231 cos A= 5/13 = .3846 tan A= 12/5 = 2.4 B sin B= 5/13 = .3846 cos B= 12/13 = .9231 tan B= 5/12 = .4167 12 C B 5 13 A

  7. Ex. Find sin A and sin 30o. A sin A = ½ or .5 30° sin 30 = .5 2 √3 60° B C 1

  8. Ex. Find sin B and sin 45o. A 45° √2 1 sin 45o = .7071 45° B C 1

  9. Assignment • Use your textbook… pg. 159 #1-3 pg. 168 #1-6 (Be sure to read the directions for each section!)

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