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Geometry worksheet to help students develop and apply the theorem for the measures of the base angles in isosceles triangles to calculate angle measures.
Geometry worksheet to help students apply the theorem for the measures of the base angles in isosceles triangles to calculate angle measures and to write and solve equations to find angle measures in isosceles triangles.

Activity 3.8​

Assignment 3.9

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​Assignment 4.11

​The Measures of Angles in Isosceles Triangles

 
Objectives
Measure the base angles in isosceles triangles to develop a theorem about the measures.
 
Apply the theorem to calculate angle measures in isosceles triangles.
 
 
 
 

About Geometry Worksheet Assignment 4.11:     

 

Assignment 4.11 is an introduction to a theorem about measures of angles in isosceles triangles.

 

Prerequisite Skills:  Calculate measures of angles in triangles (Assignment 4.8).  Solve algebraic equations with one variable.  Evaluate algebraic expressions.  

 

Theorems:  The base angles of an isosceles triangle are congruent.

                          The measure of a base angle of an isosceles triangle equals one-half the difference of 180 and the measure of the vertex angle.

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