Chapter 5.4, Problem 39E

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7th Edition

Alexander + 2 others

ISBN: 9781337614085

Textbook Problem

*A, C *and *F *are three of the vertices of the cube shown in the accompanying figure. Given that each face of the cube is a square, what is the measure of angle *ACF*?

To determine

**To Find:**

The angle ACF.

Explanation

Given *A, C *and *F *are three of the vertices of the cube shown in the accompanying figure. Given that each face of the cube is a square,

From then figure, observe that each side of triangle ACF is diagonal of one square. Since this is a cube, then the square on each face are congruent. Hence the diagonal of them are congruent. It follows that

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