# Geometry

## 32 terms

### Congruent line segments

Line segments with the same length

### Plane

A flat surface that extends forever in all directions

### Skew Lines

lines that lie in different planes. they are neither parallel or intersecting

### Angle

Formed by two rays that have the same endpoint

### Congruent Angles

Angles that have the same measure

### Vertical Angles

opposite angles formed by two intersecting lines

are a pair of angles with a common vertex and a common side, but no common interior points

### Complementary Angles

Two angles whose sum is 90°

### Supplementary Angles

Two angles whose sum is 180°

### Construction

is a geometric drawing made with just two tools

### Perpendicular Bisector

A line that is perpendicular to a segment at its midpoint.

### Angle Bisector

a ray that divides an angle into two congruent angles

### triangle

3 sided polygon

a four-sided polygon

### pentagon

a polygon with 5 sides

### hexagon

a polygon with 6 sides

### heptagon

A polygon with 7 sides

### octagon

an eight-sided polygon

### nonagon

A polygon with 9 sides

### decagon

a polygon with 10 sides

### dodecagon

A polygon with 12 sides

### diagonal

is a line segment that connects two vertices of a polygon and is not a side

### regular polygon

a polygon with all sides and all angles equal

is any line segment that connects the center to a point on the circle

### central angle

is an angle whose vertex is the center

### diameter

is any line segment through the center that connects the center to a point on the circle

### arc

is a part of a circle connecting two points of the circle

### sector

is a region bounded by two radii and an arc. The shaded region is a sector

### chord

is any line segment that connects two points on the circle

### semicircle

An arc that connects the endpoints of a diameter

### Congruent figures

have the same size and shape

### Similar Figures

have shape but they don't have the same size