Graduate Management Admission Test (GMAT) Practice Test

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Which property applies to opposing sides of a parallelogram?

  1. Opposite sides are unequal

  2. Opposite sides are equal

  3. All sides are equal

  4. Opposite sides are perpendicular

The correct answer is: Opposite sides are equal

In a parallelogram, one of the fundamental properties is that opposite sides are equal in length. This means that if you have a parallelogram, the side that is directly across from another side will always have the same measurement. This property arises from the definition of a parallelogram, which states that it is a four-sided figure (quadrilateral) with opposite sides that are both parallel and equal in length. This equality of opposite sides is crucial in various geometric proofs and calculations relating to the properties and area of parallelograms, as well as when establishing that certain shapes meet the criteria to be classified as parallelograms in the first place.