A dot that represents a specific location in a plane or space.

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Infinite set of points that extend in opposite directions (2 points define a line).

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An initial point and all of the points in one direction (part of a line).

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Formed by two rays with the same initial point.

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Two endpoints and all of the points in between.

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A flat surface that extends infinitely in all directions (3 points define a plane).

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Two lines that are in the same plane and do not intersect.

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Lines that cross each other at a point are called intersecting lines.

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Two lines that for 90° angles at their intersection.

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A straight line that follows the horizon (from left to right).

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A straight line that is perpendicular to a horizontal line (up and down).

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Is the point at which 2 sides of an angle meet.

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Any angle that measures less than 90°.

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Any angle that measures between 90° and 180°.

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Any angle that measures exactly 90°.

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Any angle that measures exactly 180°.

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The total sum of the angles must equal 180°.

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All 3 angles are acute.

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Has 1 right angle and 2 acute angles

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Has 1 obtuse angle and 2 acute angles.

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All 3 sides different lengths.

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Has 2 sides of equal length.

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All sides are equal.

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