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28 Cards in this Set

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  • 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 non-adjacent 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