Quadrilaterals

1. Sum of angles of a quadrilateral equals __________.
7. In a triangle ABC, two points D and E lie on sides AB and AC respectively. If the line DE, produced by connecting the two points, equals half of third side, then it can be said that points D and E are _________ of sides AB and BC.
11. In a _____________, opposite sides are equal.
12. The diagonals of a parallelogram divide it into __________ triangles.

2. The bisectors of the angles of a parallelogram form a _________.
3. A line through the midpoint of a side of a triangle parallel to another side bisects the _____ side.
4. In a parallelogram, adjacent sides are _____________.
5. If all the points are _________, we obtain a line segment.
6. A quadrilateral with any one interior angle as reflex is known as a _______ quadrilateral.
8. A quadrilateral which has a pair of parallel sides.
9. The diagonals of a rhombus are _____________ to each other.
10. A parallelogram with equal sides.