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28 Cards in this Set
 Front
 Back
Point

a. Most basic term in geometry, (undefined)
b. A location c. Represented by a capital letter 

Line

a. Infinite number of points extending in a continuous straight line
b. A line is determined by 2 points c. Line has 1 dimension – length d. Can’t measure a line 

Plane

Flat Surface with continuous length and width


Collinear

Two or more points on the same line


Line Segment

a. A subset of a line that has an endpoint
b. Can measure a line segment 

Ray

a. A subset of a line containing one endpoint
b. Extends infinitely in one direction 

Congruent Segments

Two or more line segments that are the same size


Midpoint

A point that divides a line segment into 2 congruent segments


Definition

A statement that explains or clarifies the meaning of a word or phrase


Coplanar

On the same plane


Angle

a. A geometrical figure that consists of two rays with a common endpoint (vertex)
b. Must put “<” in front of and angle’s name c. Example: < SBC i. The middle letter is always the letter that goes in the middle of the angle 

Angle Bisector

A ray from the same vertex of an angle and creates two congruent angles


Counter Example

Something that fits the definition but isn’t what you were trying to describe


Right Angle

An angle that measures exactly 90 degrees


Acute Angle

An angle that measures less than 90 degrees


Obtuse Angle

An angle that measures greater than 90 degrees


Pair of Vertical Angles

Two nonadjacent angles that are formed by two intersecting lines


Linear Pair of Angles

Two adjacent angles whose measures add to 180 degrees


Pair of Complementary Angles

Two angles whose measures add up to 90 degrees


Pair of Supplementary Angles

Two angles whose measures add up to 180 degrees


Parallel Lines

Lines in the same place that never miss (symbol ll)


Perpendicular Lines

Lines that meet at 90 degree angles


Diagonal

A line segment that connects two non adjacent vertices


Convex Polygon

A polygon where all the diagonals fall inside the polygon


Concave Polygon

A polygon where at least one diagonal falls outside of the polygon


Congruent Polygons

Polygons are congruent if only their corresponding sides and angles are congruent


Equilateral Polygon

A polygon that has all congruent sides in length


Equiangular Polygon

A polygon in which all the angles are congruent
