All angles are congruent.

In an equiangular polygon, all of its interior angles have the same measure.

All sides are congruent.

In an equilateral polygon, all of its sides have the same measure.

A regular polygon is equiangular and equilateral. That is all of its angles have the same measure, and all of its sides have the same measure.

a four-sided polygon

a quadrilateral with one pair of parallel sides

a quadrilateral with two pairs of parallel sides

a quadrilateral with four congruent sides

a quadrilateral with four right angles

a quadrilateral with four congruent sides and four right angles

a line, ray or segment that intersects two or more coplanar lines, rays or segments, each at a different point