Chapter 9.4, Problem 1E

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6th Edition

Daniel C. Alexander + 1 other

ISBN: 9781285195698

Textbook Problem

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Which of these two polyhedrons is concave? Note that the interior dihedral angle formed by the planes containing âˆ†*EJF* and âˆ†*KJF* is larger than 180

To determine

**To find:**

The concave polyhedron.

Explanation

**Approach:**

1) A polygon is a two dimensional shape form with more than two straight lines.

2) A polyhedron is a three-dimensional shape made up of polygons as sides.

3) Each flat surface of a polyhedron is a polygon and is called a face. A polyhedron must have at least four faces.

4) The line segment where two faces of a polyhedron meet is called an edge.

5) The point where three or more edges of a polyhedron meet is called a vertex.

6) A dihedral angle is the angle between two faces with a common edge.

7) A polyhedron has dihedral angles between each of their sides because each side

of a polyhedron is a plane.

8) When a polyhedron is convex, each face determines a plane for which all remaining faces lie on same side of that plane...

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