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SinΘ--Cos Θ--Tan Θ
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The Trigonometric Functions we will be looking at
SINE COSINE TANGENT
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The Trigonometric Functions
SINE COSINE TANGENT
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SINE Prounounced “sign”
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Prounounced “co-sign”
COSINE Prounounced “co-sign”
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Prounounced “tan-gent”
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Represents an unknown angle
Greek Letter q Prounounced “theta” Represents an unknown angle
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hypotenuse hypotenuse opposite opposite adjacent adjacent
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We need a way to remember all of these ratios…
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Old Hippies Are High On Old Hippie Acid
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Sin SOHCAHTOA Opp Hyp Cos Adj Hyp Tan Opp Adj Old Hippie
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Finding sin, cos, and tan
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SOHCAHTOA 10 8 6
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10.8 9 A 6 Find the sine, the cosine, and the tangent of angle A.
Give a fraction and decimal answer (round to 4 places). 10.8 9 A 6
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? 5 4 3 Pythagorean Theorem: (3)² + (4)² = c² 5 = c
Find the values of the three trigonometric functions of . ? Pythagorean Theorem: 5 4 (3)² + (4)² = c² 5 = c 3
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24.5 8.2 23.1 Find the sine, the cosine, and the tangent of angle A
Give a fraction and decimal answer (round to 4 decimal places). B 24.5 8.2 A 23.1
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Finding a side
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Ex. A surveyor is standing 50 feet from the base of a large tree. The surveyor measures the angle of elevation to the top of the tree as 71.5°. How tall is the tree? tan 71.5° ? tan 71.5° 71.5° y = 50 (tan 71.5°) 50 y = 50 ( )
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Ex. 5 A person is 200 yards from a river. Rather than walk directly to the river, the person walks along a straight path to the river’s edge at a 60° angle. How far must the person walk to reach the river’s edge? cos 60° x (cos 60°) = 200 200 60° x x X = 400 yards
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