Geometry Problem Set I Activity
If so instructed by your teacher, print out a worksheet page for these problems.

This slide shows the balance of forces on a descending glider. A horizontal, thin red line has been drawn parallel to the ground. The flight path of the glider is along the other thin red line which falls to the left. These two lines form an angle "a" called the glide angle.

The weight of the glider is given by the symbol "W" and is directed vertical, toward the center of the earth. The weight is then perpendicular to the horizontal red line drawn parallel to the ground. The drag of the glider is designated by "D" and acts along the flight path opposing the motion. Lift, designated "L," acts perpendicular to the flight path.

Problems:

1. Prove angle a is congruent to angle b, given the above relationships 
2. Prove angle b is congruent to angle k, given the above relationships 
3. Prove angle a is congruent to angle k, given the above relationships.