What do the markings on the sides and at the vertices indicate?
Type of Polygon: Quadrilateral Convex or Concave: Convex Regular or Irregular: Regular
Practice makes perfect
This polygon has four sides, so it is called a quadrilateral. The lines containing the sides do not have points in the interior of the polygon, so it is convex.
To determine whether this polygon is regular or irregular, we need to examine the markings.
The hatch marks on the sides indicate that the sides are congruent, so this polygon is equilateral.
The angle markers at the vertices indicate that all of the angles are congruent, so this polygon is also equiangular.
Since it is equilateral and equiangular, it is a regular quadrilateral.
