给您一道初中8年级数学中平行四边形几何综合题，请您给我讲解，讲出这里显性和隐形的知识点，如果找到关键点，如何推导出所问问题的答案，因为有三个问题，请逐个帮我讲，谢谢---```text Question 22. (13 points) Common Setup: In △ABC, ∠C=90°, point M is a point on segment BC, connect AM. Part (1): Text: (1) As shown in Figure 1, AC=BC, AM is the angle bisector of △ABC, ME⊥AB at point E. Question: When CM=4, find the length of AB; Figure 1 Description: Type: Geometric figure (triangle). Main Elements: - Triangle ABC with a right angle at vertex C (indicated by a square symbol). - Point M is located on the side BC. - Line segment AM is drawn. - Point E is located on the side AB. - Line segment ME is drawn, and it is perpendicular to AB at E (indicated by a right angle symbol at E). - Labels: A, B, C, M, E. Part (2): Text: (2) If the median CO of △ABC intersects AM at point F, determine the relationship between CF and MF, and explain the reason; Part (3) (Numbered as (2) in the original text): Text: (2) As shown in Figure 2, if BM=AC, point N is a point on AC, and AN=CM, connect BN intersecting AM at point P, find the measure of ∠BPM. Figure 2 Description: Type: Geometric figure (triangle). Main Elements: - Triangle ABC with a right angle at vertex C (implied by being part of the same problem and no contradictory information, though not explicitly marked in this figure). - Point M is located on the side BC. - Point N is located on the side AC. - Line segment AM is drawn. - Line segment BN is drawn. - Line segments AM and BN intersect at point P. - Labels: A, B, C, M, N, P. ```