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equidistant

equal or same distance

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point

simplest term in geometry

distinct spot of identification

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line

infinite number of points. Continues indefinitely in both directions

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plane

extends without ending and has no thickness

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collinear

points on the same line

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coplanar

points on the same plane

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intersection

two lines, rays, segments that meet or cross

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noncollinear points

points not on the same line

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segment

two points on the line and all the points between them. The two points are called the endpoints

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ray

has one endpoint and continues to infinity in one direction

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postulate

statement accepted as true

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angle

formed by intersection of two rays

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opposite rays

rays sharing a common endpoint but going in opposite directions

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congruent

of equal or same measure

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midpoint of a segment

a point which divides a segment in two equal smaller segments

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bisector of a segment

is a line, segment, or ray or plane that intersects the segment at its midpoint

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sides of an angle

the two rays which make up the angle

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vertex

point at which two rays meet to form an angle.

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acute angle

measure between 0 and 90

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right angle

measures 90 degrees exactly

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obtuse angle

measures between 90 and 180 degrees

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straight angle

measures 180 degrees exactly. A straight line is a straight angle

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protractor

measures the size of an angle

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congruent angles

angles that have the same measure

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adjacent angles

angles with a common side and common vertex

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bisector of an angle

is the ray that divides the angle into two congruent adjacent angles

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