Which is a property of a parallelogram?

Opposite sides are congruent (AB = DC).

Opposite angels are congruent (D = B).

The sum of all the angles equals 180 degrees.

If one angle is right, then all angles are right.

The diagonals of a parallelogram bisect each other.

Each diagonal of a parallelogram separates it into two congruent triangles.

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step-by-step explanation:

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

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