GEOMETRY VOCABULARY CH.1

NET

A two-demensional diagram that you can fold to form a three-dimensional figure.

ISOMETRIC DRAWING

A corner view of a three-dimensional figure.

POINT

A location (has no size).

LINE

A straight path that extends in two opposite directions without end and has no thickness. It contains infinitely many points.

PLANE

A flat surface that extends without end and has no thickness. It contains infinitely many points.

COLLINEAR POINTS

Points that lie on the same line.

COPLANAR

Points or lines that lie in the same plane.

SEGMENT

A part of a line that consists of two endpoints and all points between them.

RAY

A part of a line that consists of one endpoint and all the points of the line on one side of the endpoint.

OPPOSITE RAYS

Two rays that share the same endpoint and form a line.

POSTULATE

An accepted statement of fact.

INTERSECTION

A set of points two or more geometric figures have in common.

COORDINATE

A real number that corresponds to a point.

DISTANCE

An absolute value of the difference of the coordinates of the endpoints of a segment.

CONGRUENT SEGMENTS

Two segments that have the same length.

MIDPOINT

A point that divides the segment into two congruent segments.

SEGMENT BISECTOR

A point, a line, a ray, or a segment that intersects a segment at its midpoint (divides a segment into two congruent segments.

ANGLE

A geometric figure formed by two rays with the same endpoint.

VERTEX OF AN ANGLE

An endpoint of the rays that formed an angle

CONGRUENT ANGLES

Angles with the same measure.

ADJACENT ANGLES

Two coplanar angles with a common side, a common vertex, and no common interior points.

VERTICAL ANGLES

Two angels whose sides are opposite rays.

COMPLEMENTARY ANGLES

Two angles whose measures have a sum of 90.

SUPLEMENTARY ANGLES

Two angles whose measure have a sum of 180.

LINEAR PAIR

A pair of adjacent angles whose noncommon sides are opposite rays.

ANGLE BISECTOR

A ray that divides an angle into two congruent angles.

MIDPOINT

A midpoint of a segment i a point that divides the segment into two congruent segments

POLYGON

A closed plane figure formed by three or more segments.

CONVEX POLYGON

A polygon that has no diagonals with points outside the polygon

CONCAVE POLYGON

A poligon that has at least one diagonal with points outside the polygon

PERIMETER OF A POLYGON

The sum of the lengths of all sides

AREA

The space inside the figure

NET

A two-demensional diagram that you can fold to form a three-dimensional figure.

ISOMETRIC DRAWING

A corner view of a three-dimensional figure.

POINT

A location (has no size).

LINE

A straight path that extends in two opposite directions without end and has no thickness. It contains infinitely many points.

PLANE

A flat surface that extends without end and has no thickness. It contains infinitely many points.

COLLINEAR POINTS

Points that lie on the same line.

COPLANAR

Points or lines that lie in the same plane.

SEGMENT

A part of a line that consists of two endpoints and all points between them.

RAY

A part of a line that consists of one endpoint and all the points of the line on one side of the endpoint.

OPPOSITE RAYS

Two rays that share the same endpoint and form a line.

POSTULATE

An accepted statement of fact.

INTERSECTION

A set of points two or more geometric figures have in common.

COORDINATE

A real number that corresponds to a point.

DISTANCE

An absolute value of the difference of the coordinates of the endpoints of a segment.

CONGRUENT SEGMENTS

Two segments that have the same length.

MIDPOINT

A point that divides the segment into two congruent segments.

SEGMENT BISECTOR

A point, a line, a ray, or a segment that intersects a segment at its midpoint (divides a segment into two congruent segments.

ANGLE

A geometric figure formed by two rays with the same endpoint.

VERTEX OF AN ANGLE

An endpoint of the rays that formed an angle

CONGRUENT ANGLES

Angles with the same measure.

ADJACENT ANGLES

Two coplanar angles with a common side, a common vertex, and no common interior points.

VERTICAL ANGLES

Two angels whose sides are opposite rays.

COMPLEMENTARY ANGLES

Two angles whose measures have a sum of 90.

SUPLEMENTARY ANGLES

Two angles whose measure have a sum of 180.

LINEAR PAIR

A pair of adjacent angles whose noncommon sides are opposite rays.

ANGLE BISECTOR

A ray that divides an angle into two congruent angles.

MIDPOINT

A midpoint of a segment i a point that divides the segment into two congruent segments

POLYGON

A closed plane figure formed by three or more segments.

CONVEX POLYGON

A polygon that has no diagonals with points outside the polygon

CONCAVE POLYGON

A poligon that has at least one diagonal with points outside the polygon

PERIMETER OF A POLYGON

The sum of the lengths of all sides

AREA

The space inside the figure