Term

Definition
A point specifies only location; it has no length, width, or depth. We usually represent a point with a dot on paper, but the dot we make has some dimension, while a true point has dimension 0.
[image] 


Term

Definition
A line segment is the portion of a line lying strictly between two points. It has a finite length and no width.
[image] 


Term

Definition
A ray can be thought of as a half a line. It has a point on one end, and it extends infinitely in the other direction.
[image] 


Term

Definition
A plane is a flat, twodimensional object. We often represent a plane by a piece of paper, a blackboard, or the top of a desk. In fact, none of these is actually a plane, because a plane must continue infinitely in all directions and have no thickness at all. A plane can be defined by two intersecting lines or by three noncollinear points.


[image] 


Term

Definition
lying in the same straight line.
[image] 


Term

Definition
Two rays with a common endpoint that point in opposite directions and form a straight line.
[image] 


Term

Definition
In the same plane.
[image] 


Term

Definition
A shape, formed by two lines or rays diverging from a common point (the vertex)
[image] 


Term

Definition
A point on a line segment that divides it into two equal parts The halfway point of a line segment
[image] 


Term

Definition
A line which cuts an angle into two equal halves
[image] 


Term

Definition
Two figures are congruent if all corresponding lengths are the same, and if all corresponding angles have the same measure. Colloquially, we say they "are the same size and shape," though they may have different orientation. (One might be rotated or flipped compared to the other.)
[image] 


Term

Definition
A vertex is the point where two sides of a polygon meet.
[image] 


Term

Definition
A positive angle that measures less than 90°



Term

Definition
An angle whose measure is greater than 90° and less than 180°
[image] 


Term

Definition
An angle whose measure is exactly 90°
[image] 


Term

Definition
An angle whose measure is exactly 180°  a straight line
[image] 


Term

Definition
Two Angles are Complementary if they add up to 90 degrees (a Right Angle)
[image] 


Term

Definition
Two angles that add up to 180°
[image] 


Term

Definition
Vertical Angles are the angles opposite each other when two lines cross.
[image] 


Term

Definition
Two angles are Adjacent if they have a common side and a common vertex (corner point) and don't overlap.
[image] 


Term

Definition
Two angles that are adjacent (share a leg) and supplementary (add up to 180°)
[image] 


Term

Definition
A line is perpendicular to another if it meets or crosses it at right angles (90°).
[image] 


Term

Definition
A polygon is a twodimensional geometric figure with these characteristics:
•

It is made of straight line segments.

•

Each segment touches exactly two other segments, one at each of its endpoints.

•

It is closed  it divides the plane into two distinct regions, one inside and the other outside the polygon.

[image] 


Term

Definition
A closed figure consisting of three line segments linked endtoend. A 3sided polygon.
[image] 


Term

Definition
Quadrilateral just means "four sides" (quad means four, lateral means side).
[image] 


Term

Definition
A polygon with 5 sides
[image] 


Term

Definition
A polygon with 6 sides
[image] 


Term

Definition
A plane figure with eight straight sides and eight angles.
[image] 


Term

Definition
A plane figure with ten straight sides and angles.
[image] 


Term

Definition
A plane figure with twelve sides.
[image] 


Term

Definition
A closed plane figure bounded by three or more line segments.
[image] 


Term

Definition
Having an outline or surface that curves inward like the interior of a circle or sphere.
[image] 


Term

Definition
Having an outline or surface curved like the exterior of a circle or sphere.
[image] 


Term

Definition
a polygon with all sides and all angles equal 

[image] 


Term

Definition
A polygon that does not have all sides equal and all angles equal.
A polygon is "regular" only if all angles are equal and all sides are equal otherwise it is irregular.
[image] 


Term

Definition
(of a straight line) Joining two opposite corners of a square, rectangle, or other straightsided shape.
[image] 


Term

Definition
One of the lines that make a flat (2dimensional) shape. Or one of the surfaces that make a solid (3dimensional) object.
[image] 


Term

Definition
The distance around a twodimensional shape. Example: the perimeter of this rectangle is 3+7+3+7 = 20 The perimeter of a circle is called the circumference.
[image] 

