Chapter 1 Terms Flashcards
Point
A point has no dimension. A dot represents a point
Line
A line has one dimension. It is represented by a line with two arrowheads, but it extends without end
Through any two points, there is exactly one line. You can use any two points on a line to name it
Plane
A plane has two dimensions. It is represented by a shape that looks like a floor or a wall, but it extends without end.
Through any three points not on the same line, there is exactly one plane. You can use the three points that are not all on the same line to name a plane.
Segment
A line segment, or segment is a part of a line that consists of two endpoints and all the points on the line between the endpoints
Ray
A ray is a part of a line that consists of an endpoint and all points on the line on the side of the endpoint
Opposite Rays
Two rays that have the same endpoint and form a line are opposite rays
Congruent Segments
Congruent Segments are two or more segments that have the same length
Midpoint
The midpoint of a segment is the point that divides the segment into two congruent segments
Segment 💗💜💙sector
A segment BIsector is a point, ray, line, line segment, or plane that intersects the segment at its midpoint
Polygon
A polygon is a closed plane figure formed by three or more line segments called sides. Each side intersects exactly other two sides, one at each vertex, so that no two sides with a common vertex are collinear
Triangle
A polygon with 3 sides, and angles that add up to 180°
Quadrilateral
A polygon with 4 sides, and angles that add up to 360°
Convex Polygon
A polygon is convex when no line that contains a side of the polygon contains a point in the interior of the polygon
picture on page 28
Concave Polygon
A polygon that is not convex is concave
picture on page 28
Angle
An angle is a set of points consisting of 2 different rays that have the same endpoint called a vertex.
Sides of an angle
the 2 rays that make up an angle
Interior of the Angle
the interior of the angle is the region that contains all the points between the sides of the angle
picture on page 36
Exterior of the Angle
the exterior of the angle is the region that contains all of the points outside of the angle
picture on page 36
Acute Angle
An angle that measures more than 0° and less than 90°
Right Angle
An angle that measures 90°
Obtuse Angle
An angle that measures greater than 90° and less than 180°
Adjacent Angles
Adjacent angles are 2 angles that share a common vertex and side, but have no common interior points
Complementary Angles
Complementary angles are 2 positive angles whose measures have a sum of 90°
Supplementary Angles
Complementary angles are 2 positive angles whose measures have a sum of 180°
