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parallelogram noun [C]. âº a âflat âshape that has four âsides. The two sets of âopposite âsides are âparallel and of âequal âlength to each other. (Definition of parallelogram from the Cambridge Advanced Learners Dictionary & Thesaurus Â© Cambridge University Press).
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 ...