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72 Cards in this Set
 Front
 Back
coplanar

all in one plane


collinear

all in one line


Exterior Angle of a triangle

the angle formed when one side of the triangle is extended


concurrent lines

two or more lines that intersect at one point.


incenter

The point where the angle bisectors of a triangle meet, that is equidistant from all three sides of the triangle.


circumcenter

The point where the perpendicular bisectors of a triangle meet, that is equidistant from all three vertices of a triangle.


orthocenter

The point where the altitudes of a triangle meet.


centroid

The point where the medians of a triangle meet that is two thirds of the distance from each vertex to the midpoint of the opposite side. This is the center of gravity of the triangle.


acute triangle

A triangle with three acute angles.


Obtuse Triangle

A triange with one obtuse angle.


Scalene Triangle

A triangle with no congruent sides.


Isosceles Triangle

A triangle with two congruent sides.


Equilateral Triangle

A triangle with all sides congruent.


Right Triangle

A triangle with one right angle (angle measuring 90 degrees).


Acute Angle

Angle measuring less than 90 degrees.


Right Angle

Angle measuring 90 degrees.


Obtuse Angle

Angle measuring over 90 degrees.


Straight Angle

Angle measuring 180 degrees.


Parallel lines

Coplanar lines that do not intersect.


Perpendicular Lines

Two lines that intersect to form right angles.


Skew Lines

Lines that are not coplanar.


Transversal

A line that intersects two or more coplanar lines in different points.


Tautology

A composition of statements that is always true logically when evaluated in a truth table, regardless of the truth or falsity of its components.


Argument

Exists when a series of statements lead up to a final conclusion.


Valid Argument

if it follows the pattern of a tautology.


Proof

a valid argument in which all of the series of statements are agreed true.


postulate

statement, doesn't need to be proven.


definition

biconditional, needs to be proven.


theorum

statements that need to be proven.


midpoint

the point on a segment that divides the segment into two equal segments.


supplementary angle postulate

if two angles add up to 180 degrees, or form a straight line, they are supplementary.


transitive property of equality

If A= B and B = C, then A = C


Tautology

A composition of statements that is always true logically when evaluated in a truth table, regardless of the truth or falsity of its components.


Argument

Exists when a series of statements lead up to a final conclusion.


Valid Argument

if it follows the pattern of a tautology.


Proof

a valid argument in which all of the series of statements are agreed true.


postulate

statement, doesn't need to be proven.


definition

biconditional, needs to be proven.


theorum

statements that need to be proven.


midpoint

the point on a segment that divides the segment into two equal segments.


supplementary angle postulate

if two angles add up to 180 degrees, or form a straight line, they are supplementary.


transitive property of equality

If A= B and B = C, then A = C


Tautology

A composition of statements that is always true logically when evaluated in a truth table, regardless of the truth or falsity of its components.


Argument

Exists when a series of statements lead up to a final conclusion.


Valid Argument

if it follows the pattern of a tautology.


Proof

a valid argument in which all of the series of statements are agreed true.


postulate

statement, doesn't need to be proven.


definition

biconditional, needs to be proven.


theorum

statements that need to be proven.


midpoint

the point on a segment that divides the segment into two equal segments.


supplementary angle postulate

if two angles add up to 180 degrees, or form a straight line, they are supplementary.


transitive property of equality

If A= B and B = C, then A = C


Tautology

A composition of statements that is always true logically when evaluated in a truth table, regardless of the truth or falsity of its components.


Argument

Exists when a series of statements lead up to a final conclusion.


Valid Argument

if it follows the pattern of a tautology.


Proof

a valid argument in which all of the series of statements are agreed true.


postulate

statement, doesn't need to be proven.


definition

biconditional, needs to be proven.


theorum

statements that need to be proven.


midpoint

the point on a segment that divides the segment into two equal segments.


supplementary angle postulate

if two angles add up to 180 degrees, or form a straight line, they are supplementary.


transitive property of equality

If A= B and B = C, then A = C


Tautology

A composition of statements that is always true logically when evaluated in a truth table, regardless of the truth or falsity of its components.


Argument

Exists when a series of statements lead up to a final conclusion.


Valid Argument

if it follows the pattern of a tautology.


Proof

a valid argument in which all of the series of statements are agreed true.


postulate

statement, doesn't need to be proven.


definition

biconditional, needs to be proven.


theorum

statements that need to be proven.


midpoint

the point on a segment that divides the segment into two equal segments.


supplementary angle postulate

if two angles add up to 180 degrees, or form a straight line, they are supplementary.


transitive property of equality

If A= B and B = C, then A = C
