Chapter 11.3, Problem 26E

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6th Edition

Daniel C. Alexander + 1 other

ISBN: 9781285195698

Textbook Problem

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*In Exercises 21 to 26, use the sine, cosine, or tangent ratio to find the indicated angle measures to the nearest degree.*

To determine

**To find:**

The indicated angle measures to the nearest degree using the sine, cosine or tangent ratio.

Explanation

**Given:**

The triangle with indicated angles is shown below.

**Definition used:**

The trigonometric ratios:

**Calculation:**

Now consider the angle

We have

From the figure,

Let us use Ti-83 calculator to find the value of

Press

Since we need to find the value of degree, we need to change the mode to degrees.

Press

Now press the following buttons in the same sequence.

Then press

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