Unit 1-2 Vocabulary

Question 1

Collinear

Answer 1

Points that lie on the same line.

Question 2

Coplanar

Answer 2

Points that lie on the same plane.

Question 3

Opposite rays

Answer 3

Rays that have the same endpoint.

Question 4

Intersections

Answer 4

2+ points intersect when they have one or more points in common.

Question 5

Postulate

Answer 5

Something that is accepted without proof.

Question 6

Congruent segments

Answer 6

Two line segments that are the same length.

Question 7

Segment bisector

Answer 7

A point, ray, line, line segment or plane that intersects a segment at its midpoint.

Question 8

Midpoint

Answer 8

The point in the exact middle of a line.

Question 9

Midpoint formula

Answer 9

X1+X2/2 ,Y1+Y2/2

Question 10

Vertex

Answer 10

The tail of an angle

Question 11

Bisecting angles

Answer 11

A ray that divides an angle into two angles that are congruent.

Question 12

Supplementary angles

Answer 12

Two angles that add up to 180 degrees.

Question 13

Complimentary angles

Answer 13

Two angles that add up to 90 degrees.

Question 14

Adjacent angles

Answer 14

Two angles that share a common vertex and side but have no common interior points.

Question 15

Vertical angles

Answer 15

Two angles who form opposite rays, they only share a vertex.

Question 16

Converse

Answer 16

q - p

Question 17

Inverse

Answer 17

~p - ~q

Question 18

Contrapositive

Answer 18

~q - ~p

Question 19

Conditional

Answer 19

p - q

Question 20

Negation

Answer 20

The opposite of the original statement.

Question 21

Perpendicular

Answer 21

Two lines that intersect at a 90 degree angle.

Question 22

Biconditional statement

Answer 22

If and only if

Question 23

Inductive reasoning

Answer 23

Based on obeservations

Question 24

Deductive reasoning

Answer 24

Uses facts, definitions and logic

Question 25

Counterexample

Answer 25

An example that disproves something.

Question 26

What symbol means perpendicular?

Answer 26

An upside-down T