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Euclid as the father of geometryTerms & labels in geometryLines, line segments, & raysIdentifying raysLines, line segments, and rays review
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Measuring Line SegmentsCongruent line segments
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Parallel & perpendicular lines introParallel & perpendicular linesDrawing parallel line segmentsParallel and perpendicular lines review
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Specifying planes in three dimensions
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Geometric definitions example
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The golden ratio
Test your understanding of Lines with these 9 questions.

About this unit

Learn what lines, line segments, and rays are and how to use them.