Defined Terms

How do you write a line segment?

"AB" (or whatever variable listed) with no line above

Bisector of a Segment

A line or segment that intersects the segment at its midpoint.

Ray

A ray, AB, is the set of points beginning at point A and going infinitely in the direction of point B.

Col-linear Points

A set of two or more points on the same line

Co-planer Points

A set of two or more points on the same plane

Point O is between points G and D on line m. What is not necessarily true?

GO = OD

How do you know if a point is the midpoint of a line segment?

If the point "M" is in the center of the line segment "AB" and the length of AM = MB, then point "M" is your midpoint.

Opposite rays form a _______.

Line

Point O is between points M and N on line segment MN. O is the midpoint of line segment MN if _____.

ON = OM

Betweenness of Points

Point B is between A and C if A, B, and C are collinear and the equation AB + BC = AC is true, where AB, BC, and AC are the distances between points A and B, B and C, and A and C, respectively.

Opposite Rays

Ray BA and ray BC are opposite rays if A, B, and C are collinear and B (the endpoint of both rays) is between A and C.

Length of a Segment

The distance between the endpoints of a segment.

Mid-point of a Segment

The point on a segment that divides the segment into two equal segments.

Space

The set of all possible points

Line Segment

The set of two different endpoints and all points between them.

True/False: A plane needs three non-collinear points to be defined

True

Adjacent Angles

Two angles in the same plane that have a common vertex and a common side, but no interior points in common.

Supplementary Angles

Two angles with measures that, when added together, equal 180°. Each angle is called the supplement of the other.

Complementary Angles

Two angles with measures that, when added together, equal 90°. Each angle is called the complement of the other.

S, U, N are collinear. What point is between the other two if NU = 1, SU = 2, SN = 3? NU + US = NS.

U

S, U, N are collinear. Which point satisfies the definition of betweenness if NU + US = NS.

U

For the following figure, complete the statement about the points.If U lies on the same line as R and N, what terms describe the relationship the three points must have?

- Betweenness of points - Col-linear - Co-planar

Vertical angles

Angles with sides that form two pairs of opposite rays.