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Published byLeslie Lloyd Modified over 7 years ago

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Trigonometric Ratios Consider the triangle given below. 1.The box in the bottom right corner tells us that this is a right triangle. 2.The acute angle at the bottom left corner is labeled as the Greek letter θ.

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3.The side opposite the right angle is called the hypotenuse. 4.We will call the side opposite the angle θ opposite. 5.We will call the side adjacent to angle θ adjacent. hypotenuse opposite adjacent

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We will use the abbreviations for the sides as given below. hyp opp adj

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Basic Trigonometric Ratios The basic trigonometric ratio names are given below along with their abbreviations. These need to be memorized. 1.sine θ = sin θ 2.cosine θ = cos θ 3. tanget θ = tan θ 4.cosecant θ = csc θ 5.secant θ = sec θ 6.cotangent θ = cot θ

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Basic Trigonometric Ratios The basic trigonometric ratios are defined as ratios of sides of the right triangle. These need to be memorized. hyp opp adj

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Basic Trigonometric Ratios The basic trigonometric ratios are defined as ratios of sides of the right triangle. These need to be memorized. hyp opp adj

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Note that the triangle can be in many different positions, and there are two possible acute angles to reference, as illustrated by the following. 3 in 4 in 5 in

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