A flat surface extending in all directions.

 A plane is a two-dimensional figure.

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formula used to find

perimeter of a rectangle

P = 2L + 2W

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P = 2(8) + 2(4)

P = 16 + 8

P = 24

points that lie on the same plane

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The sum of the measures of two angles is 90 degrees

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congruent

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having the same measure

 the set of points consisting of two distinct points and all inbetween them; written [image]

special intersecting lines that form right angles

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Angles in the same plane that have a common vertex and a common side, but no common interior points

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points lying on the same line

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A = L • W

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A = 8 • 4

A = 32

Where the two rays making up angle meet.

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cuts a segment into 2 equal halves

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cuts an angle into 2 equal angles

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 An exact location in space, usually represented by a dot and labeled with a capital letter

• A

Two angles whose measures have a sum of 180

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points that do not all lie on a single line

angle whose measure is 90°

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angle whose measure is less than 90°

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angle whose measure is greater than 90°

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What is the name of the line on the left?

Are the points collinear or noncollinear?

Why does the line on the right have a m?

points A and B are collinear

You can call that Line AB or  [image]

You can also label a line by a lowercase script letter like line m

A part of a line starting at a particular point and extending infinitely in one direction.

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Two rays sharing a common endpoint.

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The longest side of a right triangle. It is directly across from the right angle.

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a point that divides a segment into two equal pieces

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a + b

2

an assumption based on given information;

an educated guess

if not q, then not p

Switching the hypothesis and conclusion of a conditional statement and negating both.

"If it is raining then the grass is wet"

the contrapositive is

"If the grass is not wet then it is not raining."

Switching the hypothesis and conclusion of a conditional statement.

 "If it is raining then the grass is wet"

The converse is

"If the grass is wet then it is raining."

Negating both the hypothesis and conclusion of a conditional statement.

 "If it is raining then the grass is wet"

The inverse is:

"If it is not raining then the grass is not wet".

States that if p=>q is true and p is true, then q must be true.

If an angle is obtuse, then it cannot be acute.
Angle A is obtuse.
Therefore
Angle A cannot be acute

If p=>q and q=>r are both true, then p=>r is true.

If the electric power is cut, then the refrigerator does not work. 
If the refrigerator does not work, then the food is spoiled. 
So if the electric power is cut, then the food is spoiled.  

A quantity is congruent (equal) to itself. 

a = a

If

a = b

then

b = a

If

a = b

and

b = c

then

a = c

if a = b then

a + c = b + c

and

a - c = b - c

If a = b

then

a • c = b • c

if c is not 0

then

a = b

                                            c    c

Angle Addition Postulate

(ADD)

The measure of the larger angle is the sum of the measures of the two smaller ones.

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Segment Addition Postulate

(SAP)

The distance from one endpoint to the otherendpoint is the sum of the distances from a point between them  to either endpoint.