21 terms

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perpendicular line segments
Two line sements that intersect at right angles.
line segment
A part of a line between and including two points, called endpointsof the segment.
line
A 1-dimensional straight path that extends forever in opposite directions.
ray
A part of a line starting at the endpoint and continuing forever in one direction.
right angle
An angle that is 90 degrees.
vertex
The point at which the rays of an angle meet.
intersecting lines
Two lines that cross one another but do not for a 90 degree angle.
convex
A polygon in which all vertices appear to be pushed outward.
concave
A polygon in which at least one vertex appear to be pushed inward.
A four-sided polygon
parallel lines
Lines in a plane that are the same distance apart and never meet.
rectangle
A parallelogram with all right angles.
rhombus
A parallelogram with all sides the same length.
trapezoid
A quadrilateral that has exactly one pair of parallel sides.
parallelogram
A quadrilateral with two pairs of parallel.
kite
A quadrilateral with two distinct pairs of adjacent sides of equal length.
parallel rays
Two rays that are the same distance apart and never meet.