Quadrilaterals ...

ABCD is a quadrilateral whose diagonal AC divides it into two parts equal in area, then ABCD is :

Three angles of a quadrilateral are $$ 70^{\circ}, 120^{\circ}$$ and $$65^{\circ}$$. Then the fourth angle of the quadrilateral is:

Angles of a quadrilateral are in the ratio $$3 : 6 : 8 : 13$$. The largest angle is :

If three angles of a quadrilateral are $$70^{\circ}, 95^{\circ}$$ and $$105^{\circ}$$, then the fourth angle is :

In a quadrilateral $$ABCD$$, if $$\angle A = 80^{\circ},\angle B=70^{\circ}, \angle C=130^{\circ} ,$$ then $$\angle D$$ is:

In a quadrilateral PQSR, with a  diagonal PS, if $$QS = SR$$ and $$ \angle QSP = \angle RSP$$, then consider the following statements
Assertion (A) : $$\angle QPS = \angle RPS$$
Reason (R) : Triangles QPS and RPS are congruent.Of these statements 

Complete the following statement.

If a line divides any two sides of a triangle in the same ratio, then the line is parallel to the _______ side.

The diagonals of a quadrilateral ABCD are perpendicular. The quadrilateral formed by joining the mid points of its sides, is ?