An INVENTORY is a list of terms and assumptions used to prove that our observations about geometric behavior hold true.
As we go along, our inventory will be refined to be as clear as possible. As we prove, disprove, and salvage our observations about geometric behavior, we will maintain a list of those theorems. This is called a deductive system in mathematics.
We will always strive to be thoughtful of the language we use in our definitions. Clarity and brevity is important.
Let's consider the term "line segment". Take a moment right now to write down a definition for "line segment".
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Measuring an angle interactive website
http://www.woodlands-junior.kent.sch.uk/maths/shapes/angles.html#angles
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MIDPOINTS
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DIAGRAMS and SPECIAL MARKINGS - see diagrams at the link below.
www.eserc.stonybrook.edu/glenn/geometry/
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ANGLES - Use this link below to review the definitions for various kinds of angles and also how symbols are used.
www.regentsprep.org/regents/math/geometry/GP5/LAngles.htm
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POLYGONS - Use the link below to review the definitions of polygons.
polygon basics www.math.com/school/subject3/lessons/S3U2L1GL.html
polygon names http://www.mathsisfun.com/geometry/polygons.html
CIRCLES - Use the link below to review the definitnions of a circle and its parts.
www.coolmath.com/reference/circles-geometry.html
basics www.math.com/school/subject3/lessons/S3U1L6GL.html
mad circles turning interactive.usc.edu/members/yuechuan/archives/optical-illusion-wheels-circles-rotating.png
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VISUAL PUZZLES
SPACE FIGURES
http://www.learner.org/interactives/geometry/3d_prisms.html
Platonic Solids
http://www.learner.org/interactives/geometry/platonic.html
Using Isometric Dot paper Examples
http://mathforum.org/alejandre/escot/sample.gif
http://blogs.osc-ib.com/wp-content/uploads/2011/05/isometric-paper-from-flickr.jpg
Printable Isometric Dot Paper