Unit 4:  Triangles

Mrs. Razor's Videos and Pictures

Lesson 4.4:  Proving Triangles are Congruent

Lesson 4.3:  Exploring Congruent Triangles

Lesson 4.2:  Isosceles & Equilateral Triangles

Lesson 4.1:  Triangle Names & Measures

Other Videos & Links

Lesson 4.2:  Isosceles & Equilateral Triangles

Congruent legs and base angles of isosceles triangles: Showing that congruent legs imply equal base angles and vice versa

Equilateral triangle sides and angles congruent: Showing that all of the angles of an equilateral triangle are 60 degrees

Equilateral and isosceles example problems: Three example problems involving isosceles and equilateral triangles. 2 from Art of Problem Solving (by Richard Ruscyk) book

Another isosceles example problem: Possible angles for an isosceles triangle

Lesson 4 .1:  Triangle Names & Measures

Triangle Angle Example 1: Figuring out angles in a triangle. A little about exterior angles being the sum of the remote interior angles

Triangle Angle Example 2: Another example finding angles in triangles

Click to set Triangle Angle Example 3: Multiple ways to solve for the angles of multiple triangles
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