# How can you prove that a parallelogram is not a rectangle?

## How can you prove that a parallelogram is not a rectangle?

If a parallelogram is known to have one right angle, then repeated use of co-interior angles proves that all its angles are right angles. If one angle of a parallelogram is a right angle, then it is a rectangle.

What are the 5 properties of a parallelogram?

There are six important properties of parallelograms to know:

• Opposite sides are congruent (AB = DC).
• Opposite angels are congruent (D = B).
• Consecutive angles are supplementary (A + D = 180°).
• If one angle is right, then all angles are right.
• The diagonals of a parallelogram bisect each other.

### What is a parallelogram that is not a rectangle?

Here is an example when a parallelogram is a rectangle: Here is an example when a parallelogram is not a rectangle: 6. A trapezoid is a quadrilateral.

What are the five ways we can test to see if a quadrilateral is a parallelogram?

To prove a quadrilateral is a parallelogram, you must use one of these five ways.

• Prove that both pairs of opposite sides are parallel.
• Prove that both pairs of opposite sides are congruent.
• Prove that one pair of opposite sides is both congruent and parallel.
• Prove that the diagonals bisect each other.

#### Which steps will verify that a parallelogram is a rectangle?

Which steps will verify that a parallelogram is a rectangle? Check all that apply. Calculate the lengths of the diagonals, and show that they are equal. Calculate the lengths of all sides, and show that both pairs of opposite sides are congruent.

How do you prove that a quadrilateral is not a rectangle?

1) Show that all angles are 90 degrees. 2) Show that one set of sides is parallel ,and that two opposite angles are 90 degrees. 3) Show that the diagonals bisect each other, and that they are equal in length.

## What are the 5 properties of a rectangle?

The fundamental properties of rectangles are:

• A rectangle is a quadrilateral.
• The opposite sides are parallel and equal to each other.
• Each interior angle is equal to 90 degrees.
• The sum of all the interior angles is equal to 360 degrees.
• The diagonals bisect each other.
• Both the diagonals have the same length.

How is a parallelogram different from a rectangle?

FAQs on Difference Between Rectangle and Parallelogram A parallelogram has opposite sides equal, while in a rectangle, the opposite sides are equal with all its adjacent sides being perpendicular to each other. The diagonals of a rectangle are equal whereas the diagonals of a parallelogram are not equal.

### How do you prove that ABCD is a parallelogram?

If — AB ≅ — CD and — BC ≅ — DA , then ABCD is a parallelogram. If both pairs of opposite angles of a quadrilateral are congruent, then the quadrilateral is a parallelogram. If ∠A ≅ ∠C and ∠B ≅ ∠D, then ABCD is a parallelogram.