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Point
One of the basic undefined terms of geometry. No length

Ray
a ray begins at a point and goes on forever in one direction

Angle
the union of two distinct rays that have a common end point

Vertex
the common end point of an angle

Plane
One of the basic undefined terms of geometry. Goes on forever in all directions; twodimensional and flat.

Line
One of the basic undefined terms of geometry. A set of points whose length goes on forever in two opposite directions.

Line segment
the part of a line between two points on the line

Intersecting lines
two lines meet at a point. That point is the only point that belongs to both lines

Intersection
all the points 2 figures have in common

Parallel lines
two lines in a plane that do not intersect

End points
the points at the end of a line segment

Compass
instrument used to draw circles. It has two tips � center and pencil.

Bisector
divides a segment or angle into two equal parts

Perpendicular lines
two lines that intersect to form four right angles

Circle
all points in a plane at a constant distance

Radius
the length of a line segment between the center and circumference of a circle

Equidistant
equally distant from any two or more points

Arc
a continuous portion of a circle

Congruent
having the same size

