Precalculus Enhanced with Graphing Utilities, Books a la Carte Edition Plus NEW MyLab Math -- Access Card Package (7th Edition)

7th Edition

ISBN: 9780134268231

Author: Michael Sullivan, Michael Sullivan III

Publisher: PEARSON

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Ratios

A ratio is a comparison between two numbers of the same kind. It represents how many times one number contains another. It also represents how small or large one number is compared to the other.

Trigonometric Ratios

Trigonometric ratios give values of trigonometric functions. It always deals with triangles that have one angle measuring 90 degrees. These triangles are right-angled. We take the ratio of sides of these triangles.

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Textbook Question

Chapter 8.1, Problem 59AE

Parallax One method of measuring the distance from Earth to a star is the parallax method. The idea behind computing this distance is to measure the angle formed between the Earth and the star at two different points in time. Typically, the measurements are taken so that the side opposite the angle is as large as possible. Therefore, the optimal approach is to measure the angle when Earth is on opposite sides of the Sun, as shown in the figure.

Chapter 8.1, Problem 59AE, Parallax One method of measuring the distance from Earth to a star is the parallax method. The idea

(a) Proxima Centauri is 4.22 light-years from Earth. If 1 light-year is about 5.9 trillion miles, how many miles is Proxima Centauri from Earth?

(b) The mean distance from Earth to the Sun is 93,000,000 miles. What is the parallax of Proxima Centauri?

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Chapter 8.1, Problem 58AE

Chapter 8.1, Problem 60AE

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Chapter 8 Solutions

Precalculus Enhanced with Graphing Utilities, Books a la Carte Edition Plus NEW MyLab Math -- Access Card Package (7th Edition)

Ch. 8.1 - In a right triangle, if the length of the...Ch. 8.1 - If is an acute angle, solve the equation tan= 1 2...Ch. 8.1 - If is an acute angle, solve the equation sin= 1 2...Ch. 8.1 - True or False sin 52 =cos 48 Ch. 8.1 - The sum of the measures of the two acute angles in...Ch. 8.1 - When you look up at an object, the acute angle...Ch. 8.1 - True or False In a right triangle, if two sides...Ch. 8.1 - True or False In a right triangle, if we know the...Ch. 8.1 - In Problems 9-18, find the exact value of the six...Ch. 8.1 - In Problems 9-18, find the exact value of the six...

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Solution Summary: The author explains the parallax method, which measures the angle formed between the Earth and the star at two different points in time.

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