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Trig Ratios and Cofunction Relationships

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Trig Ratios SOH-CAH-TOA

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SINE Pronounced “sign”

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Pronounced “co-sign” COSINE

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Pronounced “tan-gent” TANGENT

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Pronounced “theta” Greek Letter Represents an unknown angle

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opposite hypotenuse adjacent hypotenuse opposite adjacent

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Finding sin, cos, and tan. Just writing a ratio.

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1. Find the sine, the cosine, and the tangent of theta. Give a fraction. 35 12 37 Shrink yourself down and stand where the angle is. Identify your hypotenuse, adjacent side, and opposite side. H A O

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2. Find the sine, the cosine, and the tangent of theta 24.5 23.1 8.2 Shrink yourself down and stand where the angle is. Identify your hypotenuse, adjacent side, and opposite side. H A O

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Sin-Cosine Cofunction

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The Sin-Cosine Cofunction

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3. What is sin A? 4. What is Cos C?

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5. What is Sin Z? 6. What is Cos X?

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7. Sin 28 = ?

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8. Cos 10 = ?

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9. ABC where B = 90. Cos A = 3/5 What is Sin C?

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10. Sin = Cos 15 What is ?

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Draw ABC where BAC = 90 and sin B = 3/5 11. What is the length of AB? 12. What is tan C? 4 4/3

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13. Draw stick-man standing where the angle is and mark each given side. Then tell which trig ratio you have. O H sin

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Classwork SPW 16.4

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Homework Worksheet

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