Isosceles Triangles
Grade 9•45 minutes
Learning Objective
I can calculate the missing angles or side lengths in an isosceles triangle.
Practice Questions
This lesson includes 7 practice questions to reinforce learning.
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1. Define an isosceles triangle and explain the significance of its base angles.
2. In an isosceles triangle, if the lengths of the two equal sides are 7 cm each and the base is 10 cm, calculate the measure of the vertex angle.
3. Triangle DEF is an isosceles triangle where the base angles are each 45°. What is the measure of the vertex angle?
...and 4 more questions
Educational Video
Congruent legs and base angles of isosceles triangles | Congruence | Geometry | Khan Academy
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