Line - can be extended unlimitedly in two directions., Ray - can be extended unlimitedly in one direction., Line Segment - is limited in two directions., Measure of right angle - is 90 degrees, Measure of acute angle - is between 0 and 90 degrees, Measure of obtuse angle - is between 90 and 180 degrees, Measure of straight angle - is 180 degrees, Perpendicular - is a line, segment or ray drawn perpendicularly from a point to a line., Polygon - is a closed geometric shape formed by adding at least three line segments end to end to form an angle., Edge - Line segments forming a polygon, Corner - Points where edges meet, Interior angle - angles formed between the sides and inside the polygon, Diagonal - Line segment joining two non-adjacent vertices in polygons,

Basic Elements in Geometry

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