What's the Point?
This is one lesson within a larger Unit Plan that covers all the properties of triangles and several other theorems. Lesson 1 is “What’s the Point?” which reviews the undefined terms point, line, and plane, and develops the meanings of segments, rays, midpoints, parallel lines, congruent segments, bisector of a segment, perpendicular lines, collinear points, noncollinear points, coplanar points, noncoplanar points, skew lines, and parallel planes by looking at examples and counterexamples of the terms. The larger unit plan, with a nice unit project, can be found here. Uses cooperative learning groups, to develop definitions of basic geometry terms by comparing examples and counterexamples
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