Chapter 5, Section 3
Medians and Altitudes of a Triangle
Median of a Triangle
Is a segment whose endpoints are a vertex of the triangle & the midpoint
of the opposite side.
The point of concurrency of the medians is called the centroid of the
Answers to Chapter 3.3that are not answered in the book
Short hand fallacy key for chapter 3.3:
Appeal to Unqualified Authority = UA
Hasty Generalization = HG
False Cause = FC Slippery Slope = SS
If there is no fallacy = None
Section I. 1. HG 3. UA 4. SS
Chapter 3, Section 1
Lines & Angles
Skew Lines: Do not intersect & are not coplanar
Parallel Lines: never intersect and are coplanar
Parallel Planes: planes which do not intersect
If there is a line & a point not on the line
Chapter 2, Section 4
Subtraction: If a=b, then a-c=b-c
Multiplication: If a=b, then ac = bc
Addition: If a=b, then a+c=b+c
Division: If a=b and c0, then ac=bc
Reflexive: For any real number a = a.
Symmetric: If a = b, then
Chapter 2, Section 1
Also know as an If-then statement.
If its Monday, then I will go to school.
Hypothesis: its Monday
Conclusion: I will go to school
When you switch the hypothesis & conclusion in a conditional statement.
Chapter 1, Section 1
Patterns & Inductive Reasoning
An unproven statement that is based on observation.
Look at the figure or statement & prove that its true or false.
Example: All odd numbers can be expressed as the sum of two
Chapter 1, Section 4
Angles & Their Measures
Parts of an Angle
The endpoint they share is called the vertex.
The two rays are called the sides.
An angle can be named by its vertex alone or 3 points.
An angle is made up of two rays which have a common endp
Chapter 7, Section 1
Rigid Motion in a Plane
Transformations is moving the preimage to becoming the image.
Preimage: The original figure.
Image: the new image after the transformation.
Isometry: is a transformation which doesnt change the leng
Chapter 6, Section 1
Describing a Polygon
An enclosed figure (all segments)
Two segments meet @ a point called a vertex
Each segment is called a side.
Identifying a Polygon
Number of Sides are indicative of the name
Chapter 4, Section 1
Triangles & Angles
Naming a Triangle
Equilateral: all sides are congruent
Isosceles: two sides are congruent
Classifying by its sides:
Scalene: no sides are congruent
Classifying by its angles:
Right: there is ONE right angle (90)
Chapter 4, Section 4
Proving Triangles are Congruent:
o ASA & AAS
o Angle-Side-Angle (ASA)
o Congruence Postulate
o If two angles and the included side of one triangle are congruent to two
angles and the included side of a second triangle , then the two t
Chapter 5, Section 1
Perpendiculars & Bisectors
A segment, ray, line or plane which is perpendicular to a segment at its
midpoint is called a perpendicular bisector.
Same length (distance).
Perpendicular Bisector Theorem
5 Days, have to not quit by the 5th week.
- Every night you have opportunities to go out and party, hang out with managers, etc.
- Amount of Customers
- Level of Anger from customers.
- Purchase Items (New Clothes,