Lesson 7: Building Polygons Part 2

Triangle Inequality Exploration
Triangle Inequality Exploration
Triangle #1
Name three lengths that create a triangle
Triangle #2
Name three other lengths that create a triangle
Triangle #3
Name three other lengths that create a triangle
Triangle #4
Name three lengths that do not create a triangle
Triangle #5
Name three other lengths that do not create a triangle
Write down any observations you notice about the lengths that did make a triangle and did not make a triangle.
The Triangle Inequality Theorem states that the sum of the lengths of any two sides of a triangle must be greater than the length of the third side. In other words, if you have three line segments with lengths a, b, and c, you can form a triangle if and only if the sum of any two of these lengths is greater than the length of the third.  [br]For example[br]If you have line segments of length 3, 4, and 5, you can form a triangle because:[list][*]3 + 4 > 5[/*][*]3 + 5 > 4[/*][*]4 + 5 > 3 [/*][/list]
Prove It!
Based on the Triangle Inequality Theorem prove that one of your triangles is really a triangle
Prove It!
Based on the Triangle Inequality Theorem prove that one of your triangles is really NOT a triangle
Check for Understanding
Which of the following lengths creates a triangle? Select all that apply
Check for Understanding
Which of the following lengths does not create a triangle? Select all that apply
Close

Information: Lesson 7: Building Polygons Part 2