Contemporary Abstract Algebra
Contemporary Abstract Algebra
9th Edition
ISBN: 9781337249560
Author: Joseph Gallian
Publisher: Cengage Learning US
Question
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Chapter 1, Problem 1E
To determine

To Describe:Each symmetry in D3.

Expert Solution & Answer
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Explanation of Solution

Given: An equilateral triangle.

Calculation:

Three rotations at 0, 120 and 240 gives the symmetric in an equilateral triangle and also flips over three different axes (vertex) at the midpoint of the opposite side gives the symmetric in an equilateral triangle. So total there are six symmetries in equilateral triangle.

The three rotations at 0, 120 and 240 which gives the symmetric are:

Contemporary Abstract Algebra, Chapter 1, Problem 1E , additional homework tip  1

The three symmetries obtain by flips over three different axes are -

Contemporary Abstract Algebra, Chapter 1, Problem 1E , additional homework tip  2

Thus, there are six symmetries in equilateral triangle.

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