Concept explainers
To prove: If an angle is exterior to a
Explanation of Solution
Given information:
Proof:
Theorem 3-12:- If an angle is exterior to a triangle, then its measure equals the sum of the measures of the two remote interior angles.
As per Theorem, you need to prove that
From equation (1)
From equation (2),
Putting the value of equation (5) in equation (4), you get
Hence, the theorem is proved.
Therefore, the given equation can be used to prove Theorem 3-12.
Chapter 3 Solutions
McDougal Littell Jurgensen Geometry: Student Edition Geometry
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