This document presents a geometry vocabulary and formulas presentation. It defines key geometry terms like parallel lines, perpendicular lines, transformations, triangles, rectangles, circles, cylinders, spheres and pyramids. For each term, it provides a definition, example image and sometimes a formula for calculating measurements like area or volume. It also includes additional videos and resources for further practice with geometry concepts.

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Geometry Vocabulary & Formulas
K. Wilhite ED TECH 541

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Additional Information
Watch for Moby throughout the
presentation. When you click on him,
you can view a video with more
information.

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Parallel Lines
Two straight lines that lie in the same plane
that
will never cross
Photo used under Creative Commons from Ko:

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Perpendicular Lines
Two straight lines that cross each other at a
90o
angle
Photo used under Creative Commons from all brown

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Transformations
The different ways objects can be
moved on a coordinate plane
For more practice problems, click here

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Reflection
A mirror image of an object
Photo used under Creative Commons from Jheat

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Rotation
The turning of an object around a given
point
Photo used under Creative Commons from Juliana S.

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Translation
The movement of an object from spot to
another
Image created by K. Wilhite

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Acute Triangle
A triangle that is made up of three angles
that
measure less then 90o
Photo used under Creative Commons from

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Obtuse Triangle
A triangle that is made up of an angle that
measures greater then 90o but less then
180o
Photo taken by K. Wilhite

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Right Triangle
A triangle that is made up of one 90o angle
Photo used under Creative Commons from Parth Joshi

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Area of Triangles
Image created by K. Wilhite
For a video lesson and practice problems, click here

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Rectangle
A quadrilateral that contains four 90o angles
with opposite sides parallel
Photo used under Creative Commons from Jheat

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Area of Rectangles
Image created by K.. Wilhite

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Circle
A round plane whose boundary
(circumference)
is made up of points that are the same
distance
from the center point (radius)
Photo used under Creative Commons from Timothy

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Area of a Circle
Image created by K. Wilhite

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Trapezoid
A quadrilateral with exactly one set of
parallel
lines
Photo used under Creative Commons from ocherdraco

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Area of a Trapezoid
Image created by K. Wilhite

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Parallelogram
A quadrilateral with opposite sides parallel
Photo used under Creative Commons from Peter

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Area of a Parallelogram
Image created by K. Wilhite

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Cube
A 3D shape that consists of 6 faces made up
of
congruent squares
Photo used under Creative Commons from ocherdraco

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Volume of a Cube
Image created by K. Wilhite

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Rectangular Prism
A 3D shape that consists of 6 faces made up
of
rectangles
Photo used under Creative Commons from Bad Alley

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Volume of a Rectangular Prism
Image created by K. Wilhite

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Cylinder
A 3D shape that consists of circular base
and
straight parallel sides
Photo used under Creative Commons from brookewill

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Volume of a Cylinder
Image created by K. Wilhite

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Sphere
A 3D shape that consists whose boundary is
made up of points that are the same
distance
from the center point.
Photo used under Creative Commons from mlaudisa

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Volume of a Sphere
Image created by K. Wilhite

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Pyramid
A 3D shape that consists of a square base
and
four faces that are triangles
Photo used under Creative Commons from Neil B.

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Volume of a Pyramid
Image created by K. Wilhite

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More math videos
Area of polygons
Perimeter and Area of Rectangles
Perimeter and Area of Triangles
Volume and Surface Area
Circumference and Area of Circles
Geometry
Geometry

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Resources
BBC Schools. (n.d.). Retrieved February 18, 2013, from BBC Schools:
http://www.bbc.co.uk/schools/
BrainPop. (n.d.). Retrieved February 18, 2013, from www.brainpop.com:
www.brainpop.com
Khan Academy. (n.d.). Retrieved February 18, 2013, from Khan Academy:
https://www.khanacademy.org/
M.D. Roblyer and Aarom H. Doering. (2013). Integrating Educational
Technology into Teaching. Upper Saddle River: Pearson.
squidoo. (n.d.). Retrieved February 21, 2013, from squidoo:
http://www.squidoo.com/cc-flickr
Teachnology Tutorials. (n.d.). Retrieved February 21, 2013, from
Teachnology: http://www.teach-nology.com/tutorials/powerpoint/