There are some questions below to go with it that don't suck. No further comment. I am so sick of this lesson.
Open the Geogebra File Triangle Inequalities.ggb. (Follow the link from Edmodo, or go directly to http://www.geogebratube.org/student/m21418) You can use the sliders to change the lengths of two of the sides. You can also change the position of two of the segment endpoints. Side AB will always measure 10. Use the sliders to generate four different sets of side lengths: two that can form a triangle (you will know for sure if it turns purple,) and two that can not form a triangle.
AB

BC

AC

Can a triangle be formed?

10
 
10
 
10
 
10

1 Using the given lengths of AB and BC below, find the shortest possible integer length of AC, and the longest possible length of BC.
AB

BC

Shortest possible AC

Longest possible AC
 
10

3
 
10

5
 
10

1
 
10

14

(conjecture)
 
x

y
 
Answer this question without using Geogebra. I have three pieces of wood. The pieces measure 4 cm, 9 cm, and 11 cm. My friend has three other pieces that measure 5 inches, 8 inches, and 2 inches. Will we each be able to create a triangle? Why or why not?
