Point

 flat, two-dimensional object 

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 line has only one dimension: length. It continues forever in two directions 

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portion of a line lying strictly between two points.

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thought of as a half a line. It has a point on one end, and it extends infinitely in the other direction.

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 flat, two-dimensional object.

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- two rays with a common endpoint that form a straight line

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three or more points that lie in a straight line.

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objects are those lying in the same plane

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figure formed by two rays

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The point on a line segment dividing it into two segments of equal length

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 ray that cuts the angle exactly in half, making two equal angles

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all corresponding lengths are the same

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point where two sides of a polygon meet.

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an angle less than 90 degrees 

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an angle between 90 and 180 degrees.

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An angle of 90°, as in a corner of a square.

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An angle of 180°.

Either of two angles whose sum

is 90°.

Either of two angles whose sum

is 180°.

opposite angles made by two intersecting lines.

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Two angles are Adjacent if they have a common side and a common vertex (corner point) and

don't overlap.

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 two supplementary adjacent angles formed by two intersecting lines.

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Two segments, rays, or lines are perpendicular if and only if the lines containing them form a 90 degree angle.

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A polygon is a two-dimensional geometric figure :

Convex: 

• very internal angle is less than or equal to 180 degrees.
• Every line segment between two vertices remains inside or on the boundary of the polygon.

area surrounding figure

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