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A line is never-ending straight path.

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A segment part of a line containing two endpoints and all the points between them.

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A ray is part of a line that extends indefinitely in one direction from a fixed point.

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A plane is two-dimensional flat surface that extends in all directions.

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Opposite rays are about two rays that are part of the same line and have only their endpoints in common.

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Collinear is all about three or more points that lie on the same line. In the figure, P, Q, and R are collinear points.

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A coplanar is about points or lines that lie in the same plane.

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An angle is a figure formed by two rays with a common endpoint.

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A midpoint is a line segment, the point that is halfway between the endpoints.

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Congruent means

Having the same measure.

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The vertex is a common endpoint of the rays forming the angle.

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An acute angle is a angle with a measure greater than 0° and less than 90°.

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An obtuse angle is a type of angle that measures more than 90° but less than 180°.

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Right Angle

A right angle measures exactly 90°.

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A straight angle measures exactly to 180°.

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Two angles are complementary angles if the sum of their measures is 90°.

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Two angles are supplementary angles if the sum of their measures is 180°.

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Vertical angles are about pposite angles formed by the intersection of two lines.

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Adjacent angles are angles that have the same vertex, share a common side, and do not overlap.

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A linear pair is two supplementary adjacent angles formed by two intersecting lines.

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Perpendicular lines are lines which meet to form 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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Here are examples of a variety of polygons.

Concave- Are angles that point inwards.

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Regular- All sides of the shape are congruent.

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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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Side

The sides are the two rays that form an angle. In the figure, [image] and [image] are sides of [image]RST.[image]

or

The side is the segments that form a closed figure.

The perimeter is the distance around a closed geometric figure.

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Irregular- 2 sides of the angle are congruent but they are not congruent with the other 2. For example, a rectagle because it has the 2 short sides that are congruent with each other 2 long sides are not congruent with the short sides but onyl with each other.

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Convex- Are angles that point outwards.

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A Quadrilateral is a shape with 4 sides.

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Hexagons is a shape with 6 angles.

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Decagon is a shape with 10 sides.

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 Dodecagon is a shape that has 12 sides.

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n-gons is a polygon with n sides or number of sides in it.

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Here are examples of "n- gons".

Pentagon is a shape that has 5 sides.

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