Describe the two possible ways to use the angle of depression that is outside a right triangle to find the measure of an angle inside the triangle?

1) The angle of depression is complementary to up angle of the right triangle:

=> Angle of depression = 90° - up angle

=> up angle = 90° - angle of depression

2) The angle of depression is equal to the bottom angle of the right triangle.

=> bottom angle = angle of depression.