This document defines various geometric shapes and terms through examples and brief descriptions. It provides definitions for acute angles, collinear points, circles, cones, cylinders, lines, angles, points, obtuse angles, perpendicular lines, planes, prisms, pyramids, rays, parallel lines, parallelograms, rectangles, right angles, spheres, squares, triangles, vertices, line segments, and trapezoids. Examples are given to illustrate each term, such as street intersections for angles or a map for points.

1. Definition Project
Mallory Collier 5th hour
Geometry

2. Acute Angle
The measure of an angle with a measure between 0° and
90° or with less than 90° radians.
Pizza

3. Collinear Points
A set of points that lie in a straight line.
Easter Island

4. Circle
The set of all points in a plane that are
fixed distance from a point called the
center of the circle.
Baseball

5. Cone
A three dimensional shape with only one
vertex, having a circular base.
Ice cream
cone

6. Cyclinder
A shape with a parallel circle and each end
and joined by a curved surface.
Candles

7. Line
An undefined term in geometry, a line is a
straight path that has no thickness and
extends forever.
Street

8. Angle
A figure formed by two rays with a
common endpoint.
Street Intersectoins

9. Point
A precise location or place on a plane,
usually presented by a dot.
A map

10. Obtuse Angle
An angle having a measurement of more
than 90
A hand fan

11. Perpendicular lines
Two lines or line segments intersect and
form right angles.
Windows

12. Plane
When a set of points joined together form
a plane, the plan can extend without end in
all directions.
The twin
tower site

13. Prism
A solid object that has two identical ends
and all flat surfaces.
A tissue box

14. Pyramid
A shape where the base is a polygon and
the sides are triangles that join at the top.
The Egyptian
pyramids

15. Ray
A straight line with one end point, the line
extends infinitely.
Power lines

16. Parallel lines
Two lines on a plane that never meet, they
are always the same distance apart.
Train tracks

17. Parallelogram
A quadrilateral that has both sets of
opposite sides that are parallel.
Building architectures

18. Rectangle
A parallelogram that has four right angles.
A carpet

19. Right Angle
An angle that is equal to 90
A bird house

20. Sphere
A solid shape that resembles a ball, every
point on the surface of the shape is the
same distance from the center.
The Earth

21. Square
A four sided flat shape with equal 90
angles.
a handicapped
sign

22. Triangle
Three sided polygon.
The pool table
ball set up

23. Vertex
A point of intersection that where two or
more rays meet, often called a corner.
A spider
web

24. Line segment
A straight path that has a beginning and an
end.
A cross walk

25. Trapezoid
A quadrilateral with exactly two parallel
sides.
A popcorn holder