Which quadrilateral is a parallelogram

III figure

Step-by-step explanation:

Parallelogram:It is a figure of four sides.The opposite sides of parallelogram are equal and parallel.

Properties of parallelogram:

1.Opposite angles are equal.

2.Opposite sides are equal and parallel.

3.Sum of interior angles on the same side is equal to 180 degrees.

4.Diagonals of parallelogram bisect to each other.

When sum of interior angles on the same side is equal to 180 degrees.Then, the sides are parallel.

When one pair of opposite sides is  parallel then, the quadrilateral is a parallelogram.

In I figure:

Sum of interior angles=

Sum of interior angles=

Side AC is not parallel to side BD.

Hence, it is not a  parallelogram .

In II figure:

Sum of interior angles=

Therefore, side AC is not parallel to side BD.

Hence, it is not a  parallelogram .

In III figure:

Sum of interior angles=

Therefore, side AC is  parallel to side BD.

Hence, quadrilateral ABCD is a parallelogram.

In IV figure:

Sum of interior angles=

Therefore, side AB is not parallel to side CD.

Hence, quadrilateral ABCD is not  a parallelogram.

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step-by-step explanation: