Which statement describes a parallelogram that must be a square? 1. A parallelogram with diagonals that bisect each other and opposite sides that are congruent.
2. A parallelogram with diagonals that are congruent and opposite sides that are congruent.
3. A parallelogram with diagonals that are congruent and perpendicular.
4. A parallelogram with perpendicular diagonals.

(05.02) mr. morris is going to save money and replace his sailboat's mainsail himself. he must determine the area of the mainsail in order to buy the correct amount of material. calculate the area of the parallelogram to determine how much material should be purchased. be sure to explain how to decompose this shape into rectangles and triangles. describe their dimensions and show your work.