## What are congruent angles in a parallelogram?

Basic Properties of Parallelograms Inside a parallelogram, opposite angles are always congruent. Angles that lie next to each other are always supplementary (add up to 180 degrees).

**What are the 6 properties of 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 the properties of the parallelogram?

Convex polygon

Parallelogram/Properties

**Are the two diagonals of a parallelogram equal?**

Are the Diagonals of a Parallelogram Equal? The diagonals of a parallelogram are NOT equal. The opposite sides and opposite angles of a parallelogram are equal.

#### What are the qualities of a parallelogram?

The properties of the parallelogram are simply those things that are true about it. These properties concern its sides, angles, and diagonals. The parallelogram has the following properties: Opposite sides are parallel by definition. Opposite sides are congruent. Opposite angles are congruent.

**How do you prove a parallelogram?**

You can also prove the parallelogram part by showing that opposite pairs of sides have equal lengths. Then showing that any one angle is a right angle is sufficient to prove that it is a rectangle.

## What shapes are not a parallelogram?

If only one set of opposite sides are congruent, you do not have a parallelogram, you have a trapezoid. This means every parallelogram is: A plane figure (it has two dimensions) A closed shape (it has an interior and exterior) A quadrilateral (four-sided plane figure with straight sides)

**What is always true about a parallelogram?**

It is always true. A parallelogram is a quadrilateral where opposite sides are parallel. So a quadrilateral ABCD is a parallelogram if and only if AB is parallel to DC, and BC is parallel to AD. The angles between side AB and adjacent sides AD and BC are supplementary (their measures add up to .