A precise location or place on a plane. Usually represented by a dot.

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A geometrical object that is straight, infinitely long and infinitely thin.

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The region between a chord of a circle and its associated arc

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A portion of a line which starts at a point and goes off in a particular direction to infinity.

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 Two rays with a common endpoint that point in opposite directions and form a straight line.

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A set of points that lie in a straight line

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Lying in the same plane

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 A shape, formed by two lines or rays diverging from a common point (the vertex)

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 A point on a line segment that divides it into two equal parts
The halfway point of a line segment

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A bisector is something that cuts an object into two equal parts. It is applied to angles and line segments. In verb form, we say that it bisects the other object.

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 Equal in size and shape

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The common endpoint of two or more rays or line segments

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The common endpoint of two or more rays or line segments

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A straight angle is 180 degrees

two angles that add up to 180°

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As in normal usage, the word 'adjacent' in geometry refers to items that are next to each other in a figure.

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The two supplementary adjacent angles formed by two intersecting lines.

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Regular polygon

a polygon that is equalateral

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a polygon that is not equal on all sides.

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A diagonal is a line joining two nonconsecutive vertices of a polygon or polyhedron.

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a single segment from the union that forms a polygon

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when you add all the sides of a shape

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when a polygon is not caved in

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when a polygon is caved in

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three sided polygon

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4 sides polygon

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5 sided polygon

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6 sided polygon

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8 sided polygon

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10 sided polygon

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12 sided polygon

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15 sided polygon

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