# Geometry Terms

### 21 terms by csieling

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### point

a location in space; it has no size

### line

a series of points that extends in opposite directions without end

### plane

a flat surface with no thickness. It contains many lines and extends without end in the directions of all its lines

### segment

part of a line; it has two endpoints.

### ray

part of a line; it has exactly one endpoint. Name its endpoint first

### parallel lines

two lines that lie in the same plane and have no points in common

### intersecting lines

lines that lie in the same plane and have exactly one point in common

### skew lines

lines that lie in different planes; they are not parallel and do not intersect

### acute angle

an angle that is less than 90˚

### obtuse angle

an angle that is greater than 90˚ and less than 180˚

### straight angle

an angle that is equal to 180˚

### right angle

an angle that is equal to 90˚

angles that share a vertex and a side but have no points in their interiors

### vertical angles

angles formed by two intersecting lines and are opposite each other. The opposite angles have the same measure

### supplementary angles

the sum of the measure of two angles equals 180˚

### complementary angles

the sum of the measure of two angles equals 90˚

### transversal

a line that intersects two other lines in different points

### corresponding angles

angles that lie on the same side of the tranversal and in the same relative position

### alternate interior angles

angles between a pair of lines and on the opposite sides of the transversal

### vertex

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

### perpendicular lines

lines that intersect to form right angles

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