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A parallelogram has 2 sets of parallel sides. The opposite sides  are equal in length and opposite angles are equal. Examples of  parallelograms are squares, rectangles and â¦ rhombuses. You can find  the perimeter of a parallelogram by doubling the base+side length. 6 people found this useful.
3. A parallelogram is a rectangle if and only if its diagonals are congruent. Construction workers use the fact that the diagonals of a rectangle are congruent (equal) when attempting to build a square footing for a building, a patio, a fenced area, a table top, etc. Workers measure the diagonals. Rhombus I have all of the properties of the parallelogram PLUS - 4 congruent sides-diagonals bisect angles-diagonals perpendicular. Using the definition, the properties of the rhombus. can be proven true and become theorems. When dealing with a rhombus, the definition and theorems are stated as ...