Quadrilateral

3. A quadrilateral where diagonals are equal and bisect each other
5. The line segment joining the mid-points of two sides of a triangle is ______ the length of the third side
6. In a parallelogram, opposite angles are always ______
9. A special parallelogram where diagonals are equal and bisect at right angles.
11. A quadrilateral is a parallelogram if its opposite _____ are equal
12. A square is a parallelogram where diagonals are equal and meet at _____ degrees
13. When diagonals intersect at 90 degrees, they are said to be at ______ angles.
14. A four-sided polygon
15. Diagonals of a parallelogram ______ each other (cut each other in half)

1. These lines in a parallelogram divide it into two congruent triangles
2. If a pair of opposite sides of a quadrilateral is both equal and parallel, it is a ______.
4. The sum of the interior angles of any quadrilateral is this many degrees
7. The Mid-point Theorem states a line joining mid-points of two sides of a triangle is ______ to the third side
8. Triangles that are identical in shape and size (created by a parallelogram's diagonal)
10. A parallelogram where all four sides are equal and diagonals bisect at right angles