Two angles of a parallelogram measure and . What are the possible values of ?

Note: Figure NOT drawn to scale.

The above figure is of a rhombus and one of its diagonals. What is equal to?

Note: Diagram is NOT drawn to scale.

Refer to the above diagram.

Any of the following facts alone would be enough to prove that is not a parallelogram, EXCEPT:

Rhombus has two diagonals that intersect at point ; .

What is ?

Which of the following can not be the measures of the four interior angles of a quadrilateral?

A circle can be circumscribed about each of the following figures except:

Quadrilateral is inscribed in circle . . What is ?

Refer to the above figure. You are given that Polygon is a parallelogram, but NOT that it is a rectangle.

Which of the following statements is not enough to prove that Polygon is also a rectangle?