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# Lines

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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.