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Geometry Chapter 1
Davisha Risher
36
Mathematics
10th Grade
10/18/2012

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Cards

Term

Point : 

 
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 

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Term
Line : 
Definition
A line has only one dimension: length. It continues forever in two directions (so it has infinite length), but it has no width at all. A line connects two points via the shortest path, and then continues on in both directions.
Term
Segment
Definition
A line segment is the portion of a line lying strictly between two points. It has a finite length and no width.
Term
Ray 
Definition

 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.

 
Term
Plane
Definition

A plane is a flat, two-dimensional 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 non-collinear points.

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Term
Collinear
Definition
  • Three or more points that lie on the same straight line are called to be Collinear.

 

 

 

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Term
Coplanor
Definition

wo objects are coplanar if they both lie in the same plane. In the figure above, the two rectangles ABCD and PQRS are both coplanar.





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Term
Angle
Definition
 Angles are formed by two rays that begin at the
same point or share the same endpoint. 
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Term
Midpoint
Definition

Midpoint of a line segment is the point that is halfway between the endpoints of the line segment.

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Term
Biscetor
Definition

Angle Bisector is a ray that divides an angle into two equal parts.

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Term
Congruent 
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.)

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Term
Vertex
Definition

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A vertex is the point where two sides of a polygon meet.

 
Term
Acute angles
Definition

The measure of an angle with a measure between 0° and 90° or with less than 90° radians.

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Term
Obtuse Angle
Definition
Angle measures greater than 90 degrees but less than 180 degrees.
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Term
Right Angle
Definition
A right angle measures exactly 90 degrees. (Remember the uppercase letter L which will help you remember the angle of a right angle)
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Term
Straight Angle
Definition
Straight Angles measure exactly 180 degrees
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Term
Complementary Angles
Definition
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 The two angles involved when the sum is 90°.


Term
Supplementary angles
Definition

Two Angles are Supplementary if they add up to 180 degrees.

They don't have to be together to be supplementary, just so long as the total is 180 degrees.


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Term
Verticle angles
Definition

Vertical Angles are the angles opposite each other when two lines cross.

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Term
Adjacent angles
Definition

Either of two angles having a common side and a common vertex.


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Term
Linear pair
Definition

Linear Pair is a pair of adjacent angles that form a straight line.


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Term
Polygon
Definition

Polygons are 2-dimensional shapes. They are made of straight lines, and the shape is "closed" (all the lines connect up).

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Term
Triangle, Quadrilateral
Definition

quadrilateral is a 2-dimensional closed shape with four straight sides.  E.g. The shape ABCD shown here is a quadrilatera

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Term
Pectagon 
Definition

Pentagon is a polygon with five sides

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Term

Hexagon

 

Definition

hexagon is a polygon with six edges and six vertices. 

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Term
Octagon
Definition

A polygon with eight sides is called an octagon

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Term
Dectagon
Definition

 

Decagon is a polygon with 10 sides and equal number of angles.

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Term
Dodecagon
Definition

A 12-sided polygon (a flat shape with straight sides).

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Term
n-gon
Definition

A polygon with n sides. For example, an 8-gon is another name for an octagon.

 

Term
Concave
Definition

polygon with one or more interior angles greater than 180°. It looks sort of like a vertex has been 'pushed in' towards the inside of the polygon.

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Term
Convex
Definition
Term
irregular 
Definition

A polygon whose sides are not all the same length or whose interior angles do not all have the same measure.

 

 

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Term
regular
Definition

olygon that has all sides equal and all interior angles equal


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Term
Diagonal
Definition

Diagonal is a line segment connecting two non-adjacent vertices of a polygon.


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Term
  • side 
Definition

side of a polygon is a line segment connecting any two vertices of the polygon. edge


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Term
Perimeter 
Definition

he distance around a two-dimensional shape.



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