Undefined term
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A basic figure that is not defined in terms of other figures.

You are watching: A part of a line consisting of two endpoints and all points between them

CollinearPoints that lie on the same line.
PlaneA flat surface that has no thickness and extends forever.
LineA straight path that has no thickness and extends forever.
PointA location that has no size.
CoplanarPoints that lie in the same plane.
EndpointA point at an end of a segment or the starting point of a ray.
RayA part of a line that starts at an endpoint and extends forever in one direction.
PostulateA statement that is accepted as true without proof, also called an axiom.
VertexThe common endpoint of the sides of an angle.
Opposite raysTwo rays that have a common endpoint and form a line.
SegmentA part of a line consisting of two endpoints and all points between them.
DistanceThe absolute value of the difference of the coordinates of two points.
ConstructionA method of creating a figure that is considered to be mathematically precise.
BetweenGiven three points A, B, and C, B is between A and C if and only if all three of the points lie on the same line, and AB + BC = AC.
Coordinate planeA plane that is divided into four regions by a horizontal line called the x-axis and a vertical line called the y-axis.
CoordinateA number used to identify the location of a point.
Congruent segmentsTwo segments that have the same length.
DegreeA unit of angle measure.
MidpointThe point that divides a segment into two congruent segments.
BisectTo divide into two congruent parts.
AngleA figure formed by two rays with a common endpoint.
MeasureThe use of units to find a size or quantity.
Segment bisectorA line, ray, or segment that divides a segment into two congruent segments.
Vertical anglesThe nonadjacent angles formed by two intersecting lines.
Straight angleAn angle formed by two opposite rays that measures 180°.
Acute angleAn angle that measures greater than 0° and less than 90°.
Right angleAn angle that measures 90°.
Interior of an angleThe set of all points between the sides of an angle.
Obtuse angleAn angle that measures greater than 90° and less than 180°.
Exterior of an angleThe set of all points outside an angle.
Adjacent anglesTwo angles in the same plane with a common vertex and a common side, but no common interior points.
Complementary anglesTwo angles whose measures have a sum of 90°.
Supplementary anglesTwo angles whose measures have a sum of 180°.
Angle bisectorA ray that divides an angle into two congruent angles.
Linear pairA pair of adjacent angles whose noncommon sides are opposite rays.
Congruent anglesAngles that have the same measure.
ImageA shape that results from a transformation of a figure.
PreimageThe original figure in a transformation.
ReflectionA transformation across a line.
TransformationA change in the position, size, or shape of a figure.
RotationA transformation about a point P, such that each point and its image are the same distance from P.
TranslationA transformation in which all the points of a figure move the same distance in the same direction.
legOne of the two sides of the right triangle that form the right angle.
AreaThe number of nonoverlapping unit squares of a given size that will exactly cover the interior of a plane figure.
HypotenuseThe side opposite the right angle in a right triangle.
LengthThe distance between the two endpoints of a segment.
baseAny side of a triangle.
HeightAsegment from a vertex that forms a right angle with a line containing the base.
RadiusA segment whose endpoints are the center of a circle and a point on the circle, or the distance from the center of a circle to any point on the circle.
PerimeterThe sum of the side lengths of a closed plane figure.
piThe ratio of the circumference of a circle to its diameter, denoted by the Greek letter π.
CircumferenceThe distance around the circle.

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DiameterA segment that passes through the center of a circle and whose endpoints are on the circle, or the length of such a segment.
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