Which of the following is a property of a parallelogram?

Which of the following figures do not satisfy any of the following properties?

- All sides are equal.

- All angles are right angles.

- Opposite sides are parallel.

Which of the following properties describe a trapezium?

(A) A pair of opposite side is parallel.

(B) The diagonals bisect each other.

(C) The diagonals are perpendicular to each other.

(D) The diagonals are equal.

Option: (A)

Which is the maximum number of obtuse angle that a quadrilateral can have?

How many non-overlapping triangles can we make in a n-gon (polygon having n sides), by joining the vertices?