formed by two rays (sides) with the same endpoint (vertex)

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the center of a line segment.

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a line that cuts a segment into two pieces/halves.

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when two angles have the same measurement and size.

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the endpoint of a line.

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angles that have a measurement that is less than 90 degrees. 

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obtuse angles are angles that are greater than 90 degrees.

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angles that equal 180 degrees.

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angles that equal 90 degrees.

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angles that add up to equal 90 degrees.

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opposite angles formed by the intersection of two lines.

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

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lines which meet to form right angles and whose slopes have a product of -1.

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A polygon for which a point on at least one of its diagonals lies outside the polygon.

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A polygon for which all diagonals are located in the interior of the polygon.

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A polygon that has all sides congruent and all angles congruent.

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A figure that cannot be classified as a single polygon.

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A segment joining two nonconsecutive vertices of a polygon.

The distance around a closed geometric figure.

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A specific location in space with no size or shape.

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A never-ending straight path.

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Part of a line containing two endpoints and all the points between them.

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

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

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

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A polygon having four sides.

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A polygon having five sides.

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A polygon having six sides.

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A polygon having eight sides.

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A polygon having ten sides.

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A polygon having twelve sides.

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A polygon with n sides.

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