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Geometry

### line

a series of points that extend in opposite directions without end.

### ray

a part of a line with one endpoint and all points of the line on one side of the endpoint.

### segment

a part of a line with two endpoints and all points in between.

### plane

a flat surface that extends indefinitely in all directions and has no thickness.

### intersecting lines

lie in the same plane and have exactly one point in common.

### parallel lines

lines in the same plane that never intersect.

### skew lines

lie in different planes and are neither parallel nor intersecting.

### angle

is a figure formed by two rays with a common endpoint.

### vertex

the point of intersection of two sides of an angle or figure.

### point

a location in space that has no size

### acute angle

an angle less than 90 degrees but more than 0 degrees

### obtuse angle

an angle between 90 and 180 degrees

### right angle

an angle that measures 90 degrees

### straight angle

an angle of 180 degrees

### complementary angles

Two angles whose sum is 90 degrees

### supplementary angles

Two angles whose sum is 180 degrees

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

### vertical angles

opposite angles formed by two intersecting lines

### congruent angles

angles that have equal measures

### congruent sides

sides that have the same length.

Example: