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The document defines key concepts in Euclidean geometry, including geometry definitions, notation, naming conventions, and angle theorems. Specifically, it introduces notation for parallel lines, perpendicular lines, congruent lines, and similar lines. It also covers naming angles and polygons in cyclic order, naming parallel lines in corresponding order, and marking equal lines with the same symbol. Finally, it presents theorems such as angles in a straight line summing to 180 degrees and vertically opposite angles being equal.




























































