Ch. 2 - Acute Angles and Right Triangles

Lial12th EditionTrigonometryISBN: 9780136552161, 9780135440780, 9780136881117, 9780135440827, 9780135924891Non è quello che usi tu?Cambia libro di testo

Lial 12th Edition

Ch. 2 - Acute Angles and Right Triangles

Problema 2.3.18

Capitolo 3, Problema 2.3.18

Use a calculator to approximate the value of each expression. Give answers to six decimal places. In Exercises 21–28, simplify the expression before using the calculator. See Example 1. tan(-80° 06')

Guida verificata passo dopo passo

First, convert the angle from degrees and minutes to a decimal degree format. Since there are 60 minutes in a degree, convert 6 minutes to degrees by dividing 6 by 60: \(6' = \frac{6}{60} = 0.1^\circ\).

Add this decimal to the degrees part of the angle: \(-80^\circ 06' = -80^\circ - 0.1^\circ = -80.1^\circ\).

Recall that the tangent function is periodic with period \(180^\circ\), so you can use the identity \(\tan(\theta) = \tan(\theta + 180^\circ k)\) for any integer \(k\) to simplify the angle if needed. However, in this case, the angle is already within a common range for calculator input.

Use a calculator set to degree mode to find \(\tan(-80.1^\circ)\). Make sure the calculator is in degree mode, not radians.

Finally, round the result to six decimal places as requested.

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Angle Measurement and Conversion

Angles can be expressed in degrees, minutes, and seconds, where 1 degree equals 60 minutes. To use a calculator, angles in degrees and minutes must be converted to decimal degrees by dividing the minutes by 60 and adding to the degrees. For example, -80° 06' converts to -80.1°.

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Percorso guidato

5:31

Reference Angles on the Unit Circle

Tangent Function and Its Properties

The tangent function relates an angle in a right triangle to the ratio of the opposite side over the adjacent side. It is periodic with period 180°, and its values can be positive or negative depending on the angle's quadrant. Understanding the sign and behavior of tangent helps interpret results correctly.

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Percorso guidato

5:43

Introduction to Tangent Graph

Using Calculators for Trigonometric Approximations

Calculators typically require angles in decimal degrees or radians to compute trigonometric values. After converting the angle, use the calculator's tangent function to find the approximate value. Rounding the result to six decimal places ensures precision as requested.

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Percorso guidato

4:45

How to Use a Calculator for Trig Functions

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