a polygon in which no diagonal contains points in the exterior of the polygon.
a polygon in which a diagonal can be drawn such that part of the diagonal contains points in the exterior of the polygon.
a segment that connects any two nonconsecutive vertices of a polygon.
a polygon that is both equilateral and equiangular.
side of a polygon
one of the segments that forms a polygon.
vertex of a polygon
the common endpoint of two sides of the polygon.
base of a trapezoid
one of the two parallel sides of the trapezoid.
base angle of a trapezoid
one of a pair of consecutive angles whose common side is a base of the trapezoid.
a quadrilateral with exactly one pair of parallel sides.
midsegment of a trapezoid
the segment whose endpoints are the midpoints of the legs of the trapezoid.
leg of a trapezoid
one of the two nonparallel sides of the trapezoid.
a trapezoid in which the legs are congruent.
a quadrilateral with exactly two pairs of congruent consecutive sides.
a quadrilateral with four right angles.
a quadrilateral with four congruent sides and four right angles.
a quadrilateral with four congruent sides.
a quadrilateral with two pairs of parallel sides.