Class of non-convex quadrilaterals that have two pairs of adjacent congruent sides.

A deltoid is sometimes called a

**chevron**.### Examples

### Properties

- The diagonals of a deltoid are perpendicular to each other.
- A deltoid has an axis of symmetry that contains one of the diagonals of the figure.

The other diagonal is located outside the figure.

### Formula

The area *A* of a deltoid with diagonals *d* and *D* is : *A* = (*d* *× D*) ÷ 2.