Concept explainers
To prove: the given theorem two columns method.
Explanation of Solution
Given information:
Given theorem 4-1,
Two sides of a
Calculation:
The Isosceles Triangle Theorem: If two sides of a triangle are congruent, then the angles opposite to those sides are congruent.
An auxiliary line is a line added to a diagram to help in a proof. It is shown as dashed line in a diagram.
Given:
Prove:
Draw an auxiliary line
Proof:
Reason: given
Reason: because of auxiliary line
Reason: definition of bisector of an angle
Reason: reflexive property
Reason: SAS postulate
Reason: corresponding parts of
Chapter 4 Solutions
McDougal Littell Jurgensen Geometry: Student Edition Geometry
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