This geometry video tutorial provides a basic introduction into points, lines, segments, rays, and planes. It explains how to identify three collinear points and how to distinguish it from noncollinear points. It explains the difference between coplanar points and noncoplanar points. Three points are collinear if they lie on the same line. This video describes the four ways to determine a plane: 1. Three noncollinear points determine a plane. 2. Two parallel lines determine a plane. 3. Two intersecting lines determine a plane. 4. A point and a line can also determine it. This video also explains how to identify coplanar lines and noncoplanar lines and segments. It contains plenty of examples and practice problems.
Polygons:
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Quadrilaterals:
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Skew Lines:
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Triangles - Basic Introduction:
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Number of a Diagonals In a Polygon:
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Ratios and Proportions - Means Extreme:
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Similar Triangles:
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Similar Triangles - Enlargement Ratios:
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Triangle Similarity - SSS, SAS, & AAA:
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Triangle Proportionality Theorem:
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Altitude on Hypotenuse Theorem:
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Pythagorean Theorem:
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The Distance Formula:
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Distance Between 2 Points - 3D:
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Final Exams and Video Playlists:
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Full-Length Videos and Worksheets:
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