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A point is a basic undefined term of geometry. A point is a location. In a figure, points are represented by a dot. Points are named by capital letters.
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| A line is a basic undefined termn of geometry. A line is made up of points and has no thickness or width. In a figure, a line is shown with an arrowhead at each end. Lines are usually named by lowercase script letters or by writing capital letters for two points on the line, with a double arrow over the pair of letters.[image] |
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A segment is a measureable part of a line that consists two points, called endpoints, and all of the points between them.
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A ray is a line with an endpoint on one side.
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| A plane is a basic undefined term of geometry. A plane is a flat surface made up of points that has no depth and extends indefintely in all directions. In a figure, a plane is often represented by a shaded, slanted 4-sided figure. Planes are usually named by a capital sctipt letter or by three noncollinear points on the plane.[image] |
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A opposite ray are two rays in the opposite direction, but on the same line.
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A collinear point are points that lie on the same line.
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A coplanar point are points that lie on the same line.
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An angle is the intersection of two noncollinear rays at a common endpoint. The rays are called sides and the common endpoint is called the vertex.
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A midpoint is the point halfway between the endpoints of a segment.
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A bisector is a ray that forms two angles evenly.
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Congruent means having the same measure.
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A vertex is the point in which the rays in the angle intersect.
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A acute angle is an angle with a degree measure less than 90.
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A obtuse angle is a angle with degree measure greater than 90 and less than 180.
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A right angle is an angle with a degree measure of 90.
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A straight angle is a angle that has a measure of 180 degrees.
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A complementary angle are two angles that measures that have a sum of 90 degrees.
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A supplementary angle are two angles with measures that have a sum of 180 degrees.
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A vertical angle are two nonadjacent angles formed by two intersecting angles.
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A adjacent angle are two angles that lie in the same plane, have a common vertex and a common side, but no common interior points.
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A linear pair is a pair of adjacent angles whose noncommon sides are opposite rays.
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A perpendicular line are lines that form right angles.
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A polygon is a closed figure formed by a finite number of coplanar segments called sides such as the following conditions are met.
1. The sides that have a common endpoint are noncollinear.
2. Each side intersects exactly two other sides, but only at their endpoints, called the verticies.
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A triangle is a polygon with three sides.
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A quadrilateral is a polygon with four sides.
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A pentagon is a polygon with five sides.
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A hexagon is a polygon with six sides.
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A heptagon is a polygon with seven sides.
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A octagon is a polygon with eight sides.
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A nonagon is a polygon with nine sides.
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A decagon is a polygon with ten sides.
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A dodecagon is a polygon with twelve sides.
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A concave polygon is a polygon for which there is a line containing a side of the polygon that also contains a point in the interior of the polygon.
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A convex polygon is a polygon for which there is no line that contains both a side of the polygon and a point in the interior of the polygon.
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A regular polygon is a convex polygon in which all of the sides are congruent and and all of the angles are congruent.
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A irregular polygon is a polygon that is not regular.
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A diagonal is in a polygon, a segment that connects nonconsecutive verticies of the polygon.
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A side is a segment that makes up one piece of a shape.
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A perimeter is the sum of the lengths of the sides of a polygon.
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