A segment that connects any 2 nonconsecutive vertices.

If a convex polygon has n sides and S is the sum of the measures of its interior angles, then S=180(n-2).

If a polygon is convex, then the sum of the measures of the exterior angles, 1 at each vertex, is 360.

A quadrilateral with parallel opposite sides.

Opposite sides of a parallelogram are congruent.

Opposite angles in a parallelogram are congruent.

Consecutive angles in a parallelogram are supplementary.

If a parallelogram has one right angle, it has four right angles.

The diagonals of a parallelogram bisect each other.

A quadrilateral with four right angles.

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