Untitled Flashcards Set

Diagonal

A segment that connects nonconsecutive vertices of a polygon.

Exterior Angle Sum Theorem

The sum of the measures of the exterior angles of a polygon, one at each vertex.

Interior Angle Sum Formula

The formula used to find the sum of the measures of the interior angles of a convex polygon.

Isosceles trapezoid

A quadrilateral in which both pairs of base angles are congruent and the legs are congruent.

Parallelogram

A quadrilateral that is both a rectangle and a rhombus; opposite sides are parallel.

Quadrilateral

A polygon with 4 sides.

Rectangle

A quadrilateral with four right angles and the diagonals are congruent.

Regular polygon

A convex polygon in which all sides and all angles are congruent.

Rhombus

A quadrilateral with all four sides congruent and the diagonals are perpendicular.

Square

A quadrilateral that is both a rectangle and a rhombus, with four right angles and all four sides congruent.

Trapezoid

A quadrilateral with exactly one pair of parallel sides.

Kite

A quadrilateral with two distinct pairs of adjacent congruent sides.

Median of a trapezoid

A segment that joins the midpoints of the legs of a trapezoid.

Concave polygon

A polygon that has at least one diagonal with points outside the polygon.

Convex polygon

A polygon that has no diagonals with points outside the polygon.