Geometry Vocab

Front

Angle that measures less than 90 degrees

Back

Acute Angle: An angle that is smaller than a right angle.

Front

A point or line where two lines or planes meet/cross

Back

Intersection: The point at which two lines or planes meet.

Front

Middle point of a line segment

Back

Midpoint: The point that divides a line segment into two equal parts.

Front

Two rays that share an endpoint and extend in opposite directions

Back

Opposite Ray: A pair of rays that start from the same point and go in opposite directions.

Front

Angle that measures more than 90 degrees

Back

Obtuse Angle: An angle that is larger than a right angle.

Front

A straight line that divides an angle into two equal parts

Back

Angle Bisector: A ray that splits an angle into two equal angles.

Front

A line that intersects another line at a right angle

Back

Perpendicular Lines: Lines that meet at a 90-degree angle.

Front

Lines that never meet and are always the same distance apart

Back

Parallel Lines: Lines that run alongside each other and do not intersect.

Front

A part of a line that has two endpoints

Back

Line Segment: A portion of a line that is bounded by two distinct endpoints.

Front

A flat surface that extends infinitely in all directions

Back

Plane: A two-dimensional surface that has no thickness and extends infinitely.