Question

Which of the following is not a property of all parallelograms?

The opposite angles are congruent.

The opposite sides are congruent.

The consecutive angles are supplementary.

The diagonals are congruent.

Answer 1

The angles are supplementary

Answer 2

The diagonals are congruent is not a property of parallelogram

Properties of parallelogram

Parallelograms are quadrilateral with 4 sides and angles. Some of the properties are as follow:

• Opposite sides are congruent
• Opposite angles are congruent
• Consecutive angles are supplementary
• If one angle is right, then all angles are right.
• The diagonals of a parallelogram bisect each other.

Since there is no property that mentions that the the diagonals are congruent, hence this is not a property. The diagonals only bisects each other

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