In this lesson on isosceles triangles, you will learn about the properties of these triangles and how to apply them. An isosceles triangle has two equal sides and two equal angles at the base. You can prove this by drawing an angle bisector and creating two congruent triangles. The reverse is also true: if a triangle has two equal angles at the base, then it has two equal sides. This lesson covers isosceles triangles and equal lateral triangles, and how to solve problems involving them.
Learn about properties of isosceles triangles and how this information is useful.
How do you know which two sides are equal in an isosceles triangle?
Why are the base angles of an isosceles triangle congruent?
How do can you prove that if you bisect the angle between two congruent sides of an isosceles triangle, you get two congruent triangles?
How do find angles if you have a picture with a bunch of triangles touching each other?
What are the properties of isosceles triangles?
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This is a great video for examining isosceles triangles, their properties, and what implications come from the properties. Also, a problem is started in this video that is completed in Part 2 of Isosceles Triangles.