A plane is represented by a flat surface that extends without end and has no thickness.

Section 1-5

Complimentary angles are two angles whose measures have a sum of 90.

Supplementary=180 (linear pair)

Section 1-6

Segment Addition Postulate

If three points A,B, and C are collinear and B is between A and C, then AB+BC=AC

Section 1-8

Angle Addition Postulate

Ex: (4x-20)+(3x+14)=155

Combine like terms: 7x-6=155

Add 6 to each side: 7x=161

Divide each side by 7: x=23

Chapter 2

Hypothesis follows if; conclusion follows then

Converse- exchange hypothesis and conclusion; Inverse- Negate the hypothesis and conclusion; Contrapositive- Negate the hypothesis and conclusion of the converse

Biconditional uses if and only if

Law of detachment – If the hypo. Of a true conditional is true, then the conclusion is true.

Law of Syllogism- allows you to state a conclusion from 2 true conditional statements when the conclusion of 1 statement is the hypo. Of the other statement.

Reflexive prop. – a=a

Symmetric prop. – If a=b, then b=a

Transitive prop. – If a=b, and b=c then a=c

Chapter 3

You can write an equation of a line when you know its slope and at least one point on the line. Write a linear equation in slope intercept form when you know the slope and y-intercept.

Chapter 5

When three or more lines intersect at one point, they’re concurrent.

In an Acute triangle, the circumcenter is inside. In a right triangle, it is on the triangle. In an obtuse