**Let each equal angle of given quadrilateral be x.**

We know that, sum of all interior angles of a quadrilateral is 360°.

∴ x + x + x + 144° = 360°

3x + 144° = 360°

3x = 360° - 144°

3x = 216°

x = 72°

**Hence each equal angle of the quadrilateral is of 72° measures.**