point, A location in space, ray, A straight path that goes on forever in only one direction and has one endpoint., line, a straight path that goes on forever in both directions, line segment, a straight path with two endpoints, vertex, the point where two lines touch, parallel lines, Lines that never intersect, perpendicular lines, Line that intersect at right angles, or 90 degrees, intersecting lines, lines that intersect, usually at obtuse or acute angles, angle, the space between two intersecting lines, measured in degrees, right angle, 90 degrees, obtuse angle, greater than 90 degrees, less than 180, acute angle, less than 90 degrees, straight angle, 180 degrees, reflex angle, more than 180 degrees, less than 360 degrees, Degrees in a full circle turn, 360, Degrees in one fourth (1/4) of full circle turn, 90, Degrees in one half (1/2) of full circle turn, 180, Degrees in three fourths (3/4) of full circle turn, 270, Acute triangle, A triangle with 3 acute angles, right triangle, A triangle with 1 right angle, 2 acute angles, obtuse triangle, A triangle with 1 obtuse angle, 2 acute angles, equilateral triangle, A triangle with three equal sides, scalene triangle, A triangle with no equal sides, isosceles triangle, A triangle with 2 equal sides.

Geometry

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