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Vocabulary
Angles
Points, Lines and Planes
Logic and Reasoning
100
Two angles whose measures have a sum of 180.
What is supplementary?
100
Angles opposite each other when two lines intersect. They share the same vertex and are congruent to each other.
What are vertical angles?
100

Points that line all in one line

What are collinear points?

100
The converse of 'If it is a black bear, then it lives in North America'.
What is 'If it lives in North America, then it is a black bear'.
200
Follows the 'if' part of a conditional.
What is hypothesis?
200
Angles that measures exactly 90 degrees.
What is a right angle?
200

Segments that have equal lengths

What are congruent segments?

200
The inverse of 'If it is a black bear, then it lives in North America'.
What is 'If it is not a black bear, then it does not live in North America'.
300
Switches hypothesis and conclusion.
What is converse?
300
Angles that share a common side and vertex.
What is adjacent?
300

A Ray that divides an angle into two congruent adjacent angles

Angle Bisector

300

A statement that contains the words "if and only if"

What is a biconditional?

400

Accepted statement of fact.

What is a postulate?

400
In an isosceles triangle, it is the angle formed by the two congruent legs and is opposite the base.
What is vertex?
400
The point that divides the segment into two congruent segments

What is a midpoint?

400

Name the property:

If a =b, then b = a

What is the symmetric property?

500
A line that intersects two or more coplanar lines in different points

What is a transversal?

500
The angles in a triangle add up to this number of degrees.
What is 180?
500
If two points intersect, they intersect here. 

What is exactly one point?

500

A way to prove that a statement is false.

What is a counterexample.