obtuse, angle larger than 90 degrees, acute, angle smaller than 90 degrees, linear, a straight line, right angle, equal to 90 degrees, parallel, two lines that do not intersect, perpendicular, lines that intersect at right angles, intersecting, two lines that cross, line, a one-dimensional figure that extends infinitely in both directions, line segment, part of a straight line that has two endpoints, ray, part of a line that has a fixed starting point but extends infinitely in one-direction, point, an exact location in space with no size, length, width, or height, vertex, where two rays come together.

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