Definitions
Two lines on the same plane that never intersect are…?
Parallel
What are the measures of acute, right, obtuse, and straight angles?
<90, 90, >90, 180
What is the name for a measurement of a line or an angle called?
Coordinate
What is a postulate?
A statement accepted without proof
The Triangle Angle Sum Theorem states that…
The sum of the angles of a triangle is 180°
Two lines that intersect at 90 degrees are…?
Perpendicular.
What do Complementary and Supplementary angles sum to?
90 and 180
What is a given?
Something specified in the problem
What do two points determine?
A line
The angles in a linear pair are?
Supplementary
Figures that coincide exactly when superimposed are…?
Congruent
What do linear pairs sum to?
180
Addition, subtraction, multiplication, and division properties are?
What you do to each side of an equation
What do three noncollinear points determine?
A plane
If the angles in a linear pair are equal, then…
Their sides are perpendicular
A proposition that follows from one already proved is…?
Corollary
How are vertical angles related?
They are equal
What is the reflexive property?
a = a
What is the following statement called: “A line segment has exactly one midpoint”?
Corollary to the Ruler Postulate
The Betweenness of Points Theorem states that…
If A-B-C, then AB + BC = AC
A fundamental principle that is accepted as self-evidently true without proof?
Axiom or postulate
Angles that are complements or supplements of the same angle are?
Equal
What is the substitution property?
If a = b then b can be substituted for a wherever it appears
What is the protractor postulate?
The rays in a half-rotation can be numbered from 0 to 180 so that positive number differences measure angles.
The Betweenness of Rays Theorem states that…
If OA-OB-OC, then Angle AOB + Angle BOC = Angle AOC