Isosceles Theorem Worksheets
What is the Isosceles Theorem? Solving isosceles triangles requires special considerations since it has unique properties that are unlike other types of triangles. Therefore, when youâ€™re trying to prove those triangles are congruent, you need to understand two theorems beforehand. These two isosceles theorems are the Base Angles Theorem and the Converse of the Base Angles Theorem. The base angles theorem suggests that if you have two sides of a triangle that are congruent, then the angles opposite to them are also congruent. On the other hand, the converse of the Base Angles Theorem showcase that if two angles of a triangle are congruent, then the sides opposite to them will also be congruent.

Basic Lesson
Guides students through solving problems and using the Isosceles Theorem.
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Intermediate Lesson
Demonstrates the concept of advanced skill while solving Isosceles Theorem based problems. In △ ABC, the vertices have the coordinates A(0,3), B(2,0), C(0,2). Is this an isosceles triangle?
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Independent Practice 1
A really great activity for allowing students to understand the concepts of the Isosceles Theorem. Example: The altitude to the base of an isosceles triangle does not bisect the vertex angle. ( True or False)
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Independent Practice 2
Students use Isosceles Theorem in 20 assorted problems. The answers can be found below.
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Homework Worksheet
Students are provided with 12 problems to achieve the concepts of Isosceles Theorem. The altitude to the base of an isosceles triangle does not bisect the base. (True or False)
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Grad School Joke
How many graduate students does it take to change a light
bulb?
Only one. But it takes nine years.