Concept explainers
To prove: If two lines form congruent adjacent
Answer to Problem 2WE
Explanation of Solution
Given information: Adjacent angles 1 and 2 are congruent.
Proof:
Adjacent angles are in a straight line. So the sum of angles is 180 degree. Then substitute angle 2 instead of angle 1.
In step 4 apply the division property of equality. Divide both sides by 2 .
By the definition of perpendicular lines, the line l is perpendicular to n because angle 1 and angle 2 are 90 degrees.
Chapter 2 Solutions
McDougal Littell Jurgensen Geometry: Student Edition Geometry
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