In the figure below, AC is perpendicular to BD and angle ABC and angle EFG are right angles.
3. Between which two segments is BP the geometric mean?
4. Which segment is the projection of EF on the hypotenuse of triangle EFG?
5. Between which two segments is EF the geometric mean?
2. The altitude to the hypotenuse.
3. AP and PC.
4. EP and EG.