Copy of Identifying Sides of Right Triangles
The applet below provides an introduction as to how we label the legs of a right triangle with respect to ONE of its acute angles.  (Notice angle A, B, A', and B' are acute angles of a right triangle.)  
The triangles shown below are similar triangles.  Can you explain why?
1) How would you describe the hypotenuse of a right triangle?  What is it?  How do you easily find it?  
2) How, within a right triangle, would you be able to identify an acute angle's OPPOSITE LEG?  
3) How, within a right triangle, would you be able to identify an acute angle's ADJACENT LEG?