In this video you will learn the difference between a

**convex**quadrilateral and a

**concave**quadrilateral.

A

**quadrilateral**is a four sided polygon.

Quadrilaterals come in different shapes and sizes, and many common shapes we encounter daily are quadrilaterals.

A few examples would be a square, rectangle, parallelogram, rhombus, and a kite.

Quadrilaterals can be further divided by the

**interior angle**measurements.

A

**convex**quadrilateral have interior angles 180 degrees or less, a

**concave**quadrilateral has an interior angle measure greater than 180 degrees.

Most common quadrilaterals are convex, and they do not have any interior angle measure

greater than 180 degrees.

A

**concave quadrilateral**has a reflex interior angle measure. In other words one interior angle measure is greater than 180 degrees.

A

**dart**is one example of a concave quadrilateral.

A helpful method for memorizing the difference between these two types of quadrilaterals

is to think of a cave for a concave quadrilateral. The reflex angle creates a cavity of

a cave, which has an angle measure greater than 180 degrees.

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