Sides Opposite Angles in Triangles
This applet explores the relationship between an angle and the side opposite of it in a triangle.
Adjust the sides and the angles. What do you notice about the red angle and the red side? What about the blue angle and the blue side? The green angle and the green side? To explain the relationship, make side 1 and side 2 the same length and play with the angle. Does the behavior of the length of the green side make sense? Do you think this relationship would hold for quadrilaterals? Why or why not?