# Geometry-Polygons

## 23 terms

### Triangles

any polygon with 3 sides and 3 angles

a four-sided polygon

### Parallelogram

a quadrilateral whose opposite sides are both parallel and equal in length

### Trapezoid

a quadrilateral with two parallel sides

### Rectangle

a parallelogram with four right angles

### Square

a plane rectangle with four equal sides and four right angles

### Pentagon

a five-sided polygon

### Hexagon

a six-sided polygon

### Heptagon

a seven-sided polygon

### Octagon

an eight-sided polygon

### Nonagon

a nine-sided polygon

### Decagon

a polygon with 10 sides and 10 angles

### Dodecagon

a twelve-sided polygon

### n-gon

a polygon with n sides

### diagonals

a segment that connects a vertex to a nonadjacent vertex in a polygon

### equilateral

all sides are congruent

### equiangular

all angles are congruent

### regular

conforming to a standard or pattern

curving inward

### convex

curving or bulging outward

### interior/exterior angles

Interior are angles on the inside and exterior are angles on the outside

### vertices

The point of intersection of two sides of a polygon. The point of intersection of three edges of a space figure.

### sides

line segments that form the polygon