CK-12 Geometry-Concepts

8.9 Inverse Trigonometric Ratios Contents http://www.ck12.org

8.9 Inverse Trigonometric Ratios

Here you’ll learn how to use inverse trigonometric ratios to solve for missing angles in right triangles.

What if you were told that the longest escalator in North America is at the Wheaton Metro Station in Maryland
and is 230 feet long and is 115 ft high? What is the angle of elevation,x◦, of this escalator? After completing this
Concept, you’ll be able use inverse trigonometry to answer this question.

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CK-12 Foundation: Chapter8InverseTrigonometricRatiosA

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James Sousa: Introduction to Inverse Trigonometric Functions

Guidance

The wordinverseis probably familiar to you. In mathematics, once you learn how to do an operation, you also learn
how to “undo” it. For example, you may remember that addition and subtraction are considered inverse operations.