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Math 2Y

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Trig ratio- ratio of the lengths of two sides of a right Δ Always round to four decimal places

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Sine (sin) sin Cosine (cos)cos Tangent (tan)tan

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SOHCAHTOA inisinis p ppoverppover ypotypot osisosis djoverdjover ypotypot anisanis p ppoverppover djdj

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A B A B Ca b c

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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 C A B 13 12 5

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30° 60° 1 2 A B C sin A = ½ or.5 sin 30 =.5 3

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45° A B C 1 1 sin 45 o =.7071 2

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

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Geometry Notes Lesson 5.3A – Trigonometry T.2.G.6 Use trigonometric ratios (sine, cosine, tangent) to determine lengths of sides and measures of angles.

Geometry Notes Lesson 5.3A – Trigonometry T.2.G.6 Use trigonometric ratios (sine, cosine, tangent) to determine lengths of sides and measures of angles.

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