This document defines key geometry terms such as line, ray, angle, parallel and perpendicular lines, polygons, circles, and their components. It explains lines, line segments, rays, angles and their types. It also defines polygons based on their number of sides and angles, such as quadrilaterals, and specific types including rectangles, rhombi, trapezoids and parallelograms. Finally, it covers the key terms used to describe circles, such as radius, diameter and circumference.

1. Geometry
by Nolan and Ryan

2. Line
A 1-
dimensional
straight path
that extends
forever in
opposite
directions.

3. Right Angle
An angle
that is 90
degrees.

4. Perpendicular Line Segments
Two line
segments
that
intersect at
right
angles.

5. Line Segment
A part of a line
between and
including two
points, called
end-points of
the segment.

6. Vertex
The point at
which the rays
of an angle
meet.

7. Ray
A part of a line
starting at the
endpoint and
continuing forever in
one direction.

8. Intersecting Lines
Two lines that cross
one another but do
not form a 90 degree
angle.

9. Convex
A polygon in
which all vertices
appear to be
pushed outward.

10. Concave
A polygon in which at
least one vertex appear
to be pushed inward.

11. Quadrangle -
A four-sided polygon.

12. Parallel Lines
Lines in a plane that
are the same distance
apart and never meet.

13. Rectangle
A parallelogram with
all right angles.

14. Rhombus
A
parallelogram
with all sides
the same
length.

15. Trapezoid
A quadrilateral that has exactly one
pair of parallel sides.

16. Parallelogram
A quadrilateral with two pairs of
parallellines.

17. Parallel Rays
Two rays that are the same distance
apart and never meet.
.

18. Radius
A line segment from the
center of a circle to any
point on the circle.

19. Diameter
A line segment that passes through
the center of a circle and has endpoints
on the circle.

20. Circumference
The distance around a circle.

21. THeEnd
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