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### 72 Cards in this Set

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 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