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Trigonometry

Trigonometric Ratios

Definitions

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Evaluating Trigonometric Ratios

‚ÄčTo determine values of trigonometric functions,

(3, 4)

Step 1: Plot the coordinate on the coordinate plane

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Step 2: Draw the angle in standard position, with the initial side on the positive x axis and the terminal side drawn from the origin to the coordinate (3, 4).

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 Step 3: Draw the right angle triangle

 Step 4: Label the lengths of the sides x = 3 and y = 4, 

 Step 5: Using Pythagorean Theorem, determine side r. You will find that r = 5

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 Step 6: Knowing all three sides, determine the primary trigonometric ratios

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