Chapter 9.2, Problem 14E

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7th Edition

Alexander + 2 others

ISBN: 9781337614085

Textbook Problem

Refer to the prisms of Exercises 1 and 2. Which of these have symmetry with respect to one (or more) plane(s)?

To determine

**To find:**

The prism that has symmetry with respect to one (or more) plane(s).

Explanation

**Given:**

The prism from Exercise given below

**1. a) **

Bases are not regular.

**1. b) **

Bases are not regular.

**2. a) **

Bases are regular.

**2. b) **

Bases are not regular.

**Properties Used:**

Symmetry is when two or more parts are identical after a flip, slide or turn. A plane of symmetry is an imaginary plane along which the figure is flipped, slides or turned to get two or more identical parts.

To have this type of symmetry, a plane can be drawn for which each point of the space figure has a corresponding point on the opposite side of the plane at the same distance from the plane as shown in figure below

**Calculation:**

In the figure given below

draw a plane by joining the midpoints of the vertical edges

Since, each point of the space figure has a corresponding point on the opposite side of the plane at the same distance from the plane. Hence, it has symmetry with respect to one (or more) plane(s).

In the figure given below

draw a plane by joining the midpoints of the vertical edges

Sect-9.1 P-1ESect-9.1 P-2ESect-9.1 P-3ESect-9.1 P-4ESect-9.1 P-5ESect-9.1 P-6ESect-9.1 P-7ESect-9.1 P-8ESect-9.1 P-9ESect-9.1 P-10E

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