Below points A, F and B are collinear and points G and H are non collinear.Ĭoplanar points are points all in one plane and non coplanar points are points that are not in the same plane. Below is plane M:Ĭollinear points are points all in one line and non collinear points are points that are not on one line. Normally planes are labeled with capitol letters, just like points. It extends with no end or edges and has no thickness, but when we draw a plane we normally draw it as a four-sided figure. Ī geometric plane is suggested by a floor or wall.
If you know that two points are on the line you can also define it using those two points.
A line itself does not have any thickness and is labeled using a lower case letter. A line extends in two different directions with no end. Below are the points A and B.Īnother familiar geometric figure is a line. Points are in all geometric figures and we define space to be the set of all points. It does not have a certain size and is often represent with a dot and labeled using capitol letters. The simplest figure in geometry is referred to as a point. Drawing representations of points, lines and planes. Understanding the defined terms: collinear, coplanar, and intersection.Ģ. Understanding the undefined terms: point, line, plane.Ģ. Each side intersects exactly two other sides, but only at their endpoints, called the verticies.Ī triangle is a polygon with three sides.Ī quadrilateral is a polygon with four sides.Ī heptagon is a polygon with seven sides.Ī dodecagon is a polygon with twelve sides.Ī concave polygon is a polygon for which there is a line containing a side of the polygon that also contains a point in the interior of the polygon.Ī convex polygon is a polygon for which there is no line that contains both a side of the polygon and a point in the interior of the polygon.Ī regular polygon is a convex polygon in which all of the sides are congruent and and all of the angles are congruent.Ī irregular polygon is a polygon that is not regular.Ī diagonal is in a polygon, a segment that connects nonconsecutive verticies of the polygon.Ī side is a segment that makes up one piece of a shape.Ī perimeter is the sum of the lengths of the sides of a polygon.1. The sides that have a common endpoint are noncollinear.Ģ. The rays are called sides and the common endpoint is called the vertex.Ī midpoint is the point halfway between the endpoints of a segment.Ī bisector is a ray that forms two angles evenly.Ī vertex is the point in which the rays in the angle intersect.Ī acute angle is an angle with a degree measure less than 90.Ī obtuse angle is a angle with degree measure greater than 90 and less than 180.Ī right angle is an angle with a degree measure of 90.Ī straight angle is a angle that has a measure of 180 degrees.Ī complementary angle are two angles that measures that have a sum of 90 degrees.Ī supplementary angle are two angles with measures that have a sum of 180 degrees.Ī vertical angle are two nonadjacent angles formed by two intersecting angles.Ī adjacent angle are two angles that lie in the same plane, have a common vertex and a common side, but no common interior points.Ī linear pair is a pair of adjacent angles whose noncommon sides are opposite rays.Ī perpendicular line are lines that form right angles.Ī polygon is a closed figure formed by a finite number of coplanar segments called sides such as the following conditions are met.ġ. Planes are usually named by a capital sctipt letter or by three noncollinear points on the plane.Ī opposite ray are two rays in the opposite direction, but on the same line.Ī collinear point are points that lie on the same line.Ī coplanar point are points that lie on the same line.Īn angle is the intersection of two noncollinear rays at a common endpoint. In a figure, a plane is often represented by a shaded, slanted 4-sided figure. A plane is a flat surface made up of points that has no depth and extends indefintely in all directions. Lines are usually named by lowercase script letters or by writing capital letters for two points on the line, with a double arrow over the pair of letters.Ī segment is a measureable part of a line that consists two points, called endpoints, and all of the points between them.Ī ray is a line with an endpoint on one side.Ī plane is a basic undefined term of geometry.
In a figure, a line is shown with an arrowhead at each end. A line is made up of points and has no thickness or width. Points are named by capital letters.Ī line is a basic undefined termn of geometry. In a figure, points are represented by a dot. A point is a basic undefined term of geometry.
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