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A point is specific location in space with no size or shape.
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A line is infinite an length. May have a point on it.
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A segment is section of a line.
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A ray is line with one endpoint.
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A plane is a flat service infinite in 2 directions.
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Opposite Rays are two rays that are part of the same line and have only their endpoints in common.
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| Points are collinear when three or more points that lie on the same line. In the figure, P, Q, and R are collinear points. |
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Lines or points are coplanar when they are found on the same plane.
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| A angle is a figure formed by two rays with a common endpoint. In the figure, [image]RST is formed by [image] and [image] with the common endpoint (or vertex) S. |
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A midpoint is the center of a line segment
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| A bisector separates something into two congruent parts. |
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| Something is congruent when it has the same measure. |
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A vertex is the point where two or more lines meet.
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| An acute angle is an angle with a measure greater than 0° and less than 90°. |
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| An obtuse angle measures more than 90° but less than 180°. |
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A right angle measures exactly 90 degrees
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A straight angle measures 180 degrees.
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| Complementary angles have a sum of measures that is 90°. In the figure, [image]1 and [image]2 are complementary angles. |
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| Supplementary angles are two angles are supplementary if the sum of their measures is 180°. |
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| Vertical angles are opposite angles formed by the intersection of two lines. In the figure, thevertical angles are [image]1 and [image]3, and [image]2 and [image]4. |
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| Adjacent angles are angles that have the same vertex, share a common side, and do not overlap. In the figure, [image]1 and [image]2 are adjacent angles. |
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A linear pair is two angles that are adjacent who's angles add to 180. (A and B are a linear pair)
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Perpendicular lines are lines that intersect at right angles.
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| A polygon is a simple closed figure in a plane formed by three or more line segments. |
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A triangle is a polygon with 3 sides
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| A quadrilateral is a polygon having four sides. |
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A hexagon is a polygon with six sides and six angles angles.
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A octagon is a polygon with 8 sides and 8 angles.
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A decagon is a polygon with 10 sides.
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A dodecagon is a polygon with 12 sides.
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| A n-gon is a polygon with n sides. |
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A concave polygon for which a point on at least one of its diagonals lies outside the polygon. In the figure, diagonal [image] lies outside polygon JKLMN.
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| A convex polygon for which all diagonals are located in the interior of the polygon. |
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| A regular polygon has all sides congruent and all angles congruent. |
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| A irregular polygon does not have congruent sides and angle measurements.[image] |
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A diagonal is a segment joining two nonconsecutive vertices of a polygon. In the figure, [image] is a diagonal.
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A side is a segment that forms a closed figure. Or two rays that form an angles.
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Perimeter is the distance around a close geometric figure
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