a segment that connects any two 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)

The diagonals of a parallelogram bisect each other

a quadrilateral with four sides

a quadrilateral with parallel opposite sides is called

a quadrilateral with all four sides congruent, also a parallelogram.

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

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

If the legs are congrunt then the trapezoid is an

If a quadrilateral is both a rhombus and a rectangle, then it is a

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