In Exercises 23 to 34, give the indirect proof for each problem or statement.
In a plane, if two lines are intersected by a transversal so that the corresponding angles are congruent, then the lines are parallel.
To verify:
In a plane, if two lines are intersected by a transversal so that the corresponding angles are congruent, then the lines are parallel.
Consider the figure below.
Two lines
Figure
Approach:
Assume that,
The given conclusion is as follows.
Angles on a straight lines add to
So,
The sum of interior angles of a triangle is
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