Concept explainers
To find: the
Answer to Problem 12CE
Explanation of Solution
Given:
The diagram:
Concept Used:
Postulate 10: If two parallel lines are cut by a transversal then the corresponding
Theorem 3-2: If two parallel lines are cut by a transversal then the alternate interior angles are congruent.
Theorem 3-3: If two parallel lines are cut by a transversal then the same-side interior angles are supplementary.
Vertically opposite angles are congruent.
Consider the given figure:
In this figure,
Thus,
And,
Substitute
Then, by equation (1),
Chapter 3 Solutions
McDougal Littell Jurgensen Geometry: Student Edition Geometry
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