Triangle Inequality

Move the sliders to change the length of the sides of the line segments and move points C and D to form a triangle.
1.) Give at least three triples (a,b,c) representing the triangles that you have formed. 2.) Is it possible to find a triple (a,b,c) in which cannot form a triangle? Justify your answer. 3.) What conditions must be satisfied so that (a, b, c) can form a triangle?