What are the special parallelograms?

* A Rhombus is a parallelogram with four congruent sides.
* the diagonals of a rhombus are perpendicular. the diagonals bisects the angles, and bisects each other.

* A Rectangle is a parallelogram with four congruent angles, or an Equiangular parallelogram.
* The diagonals of a rectangle are congruent and bisect each other.

*A Square is a equilateral rectangle or an equilangler rhomus.
* A Square's diagonals are congruent, perpendicular and they bisect each other.

MATH PROBLEM
The measures of the angles of a quadrilateral are x+15, 2x, x-45, and 2x-60. what types of quadrilateral could be this? 

1) parallelogram 

2) rectangle

3) Trapezoid