It looks like you've uploaded a document related to a geometry exam (Geometri Bidang dan Ruang) with various problems. Would you like me to assist you with solving any of the problems mentioned in the document? Here's a quick summary of the problems in the document:

1. Problem 1: Involves a rectangle ABCD with a diagonal AC divided into 5 equal parts by points P, Q, R, and S, asking for the area of the shaded region.
2. Problem 2: Prove that a rhombus is a parallelogram.
3. Problem 3: Investigate if certain properties (possibly denoted as ss ss sd) represent congruence properties, providing justification.
4. Problem 4: Prove that the sides opposite the larger angle of a triangle are longer.
5. Problem 5: Given that points E and F are the midpoints of sides AD and BC of a trapezoid ABCD, prove that quadrilateral ABEF is also a trapezoid, and show that EF = 1/2 (AB + CD).

If you'd like help with any specific problem, please let me know!