In geometry, a deltoid is defined as a quadrilateral consisting of $2$ isosceles triangles that share a common base.

**So, what is the identification of a deltoid in the family of quadrilaterals?**

**A quadrilateral that has 2 pairs of equal adjacent sides**

Example:

**If given** : $AD=AB,DC=BC$

**Then:** $ABCD$ is a deltoid by definition.

**2****isosceles triangles****with a common base form a deltoid.****The sum of the angles in the deltoid is****$360°$****degrees.****The area of the deltoid**contains the number of quadrilaterals that cover the selected parts of the plane.**The perimeter of the deltoid**is the length of the thread with which we border the outline of the deltoid and is measured in units of length in meters or cm.