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Vertex

Common endpoint of two sides of a polygon

Diagonal

A segment that connects any two non-consecutive vertices

Equilateral Polygon

All the sides of a polygon are congruent

Equiangular Polygon

All the angles of a polygon are congruent

Regular Polygon

A polygon that is both equilateral and equiangular

A regular polygon is always _____

Convex

Sum of Interior Angle Measures

(number of sides - 2) x 180 degrees

The sum of the exterior angle measures of a convex polygon is ____

360 degrees

A quadrilateral with two pairs of parallel sides

Parallelogram

A quadrilateral with four right angles

Rectangle

A quadrilateral with four congruent sides

Rhombus

A quadrilateral with four right angles and four congruent sides

Square

A quadrilateral with exactly two pairs of congruent consecutive sides

Kite

A quadrilateral with exactly one pair of parallel sides

Trapezoid

Each of the parallel sides of a trapezoid

Base

The non-parallel sides of a trapezoid

Legs

The two consecutive angles whose common side is a base

Base Angles

A trapezoid whose legs are congruent

Isosceles Trapezoid

The segment whose endpoints are the midpoints of the legs of a trapezoid

Midsegment of a Trapezoid

Three acute angles

Acute Triangle

Three congruent acute angles

Equiangular Triangle

One right angle

Right Triangle

One obtuse angle

Obtuse Triangle