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Chapter 1 Vocabulary


equal or same distance


simplest term in geometry
distinct spot of identification


infinite number of points. Continues indefinitely in both directions


extends without ending and has no thickness


points on the same line


points on the same plane


two lines, rays, segments that meet or cross

noncollinear points

points not on the same line


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


has one endpoint and continues to infinity in one direction


statement accepted as true


formed by intersection of two rays

opposite rays

rays sharing a common endpoint but going in opposite directions


of equal or same measure

midpoint of a segment

a point which divides a segment in two equal smaller segments

bisector of a segment

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

sides of an angle

the two rays which make up the angle


point at which two rays meet to form an angle.

acute angle

measure between 0 and 90

right angle

measures 90 degrees exactly

obtuse angle

measures between 90 and 180 degrees

straight angle

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


measures the size of an angle

congruent angles

angles that have the same measure

adjacent angles

angles with a common side and common vertex

bisector of an angle

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

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