8.1 Notes
Monday, December 15, 2008
9:32 AM
Definitions:
1. A ratio is a quotient of two numbers.
2. A proportion is an equation stating that two or more ratios are
equal.
ac
bd
Or
a:b = c:d
Or
A to b = c to d
A is called the first term
B is called the se
7.1 Notes
Tuesday, December 02, 2008
1:45 PM
Theorem 50: The sum of the measures of the three angles of a
triangle is 180
Proof:
Given: ABC
Prove: mBAC + m B + mC = 180
A
m
C
B
Definition: An Exterior angle of a polygon is an angle that is
adjacent to and
6.1 Notes
Tuesday, November 18, 2008
7:46 AM
Definition: The point of intersection of a line and a plane is
called the foot of the line.
Postulate: Three noncollinear points determine a plane.
Theorem 45: A line and a point not on the line determine a
pla
5.1 notes
Sunday, November 02, 2008
3:09 PM
Indirect proof procedure.
1. List the possibilities for the conclusion.
2. Assume the negation of the desired conclusion is correct.
3. Write a chain of reasons until you reach an impossibility.
This will be a c
4.1 Notes
Monday, October 20, 2008
1:52 PM
x x y y2
Midpo int 1 2 , 1
2
2
Example 1:
Find the coordinates of the midpoint.
A(5, 2)
2
M
-5
5
B(2, -1)
-2
-4
Example 2: M is the midpoint of segment AB. Find the
coordinates of point B.
A(5, 2)
2
M(2, 1.5)
B
3.1 Notes
Wednesday, October 01, 2008
8:33 PM
Definitions:
1. Congruent triangle: all pairs of corresponding parts are congruent.
2. Congruent Polygons: all pairs of corresponding parts are congruent.
Postulate: Any segment or angle is congruent to itself
2.1 notes
Thursday, September 18, 2008
12:42 PM
Definition: If two lines are perpendicular, then they form right
angles.
Example1:
Given : AB
BC
DC
Pr ove : B
BC
C
D
A
B
C
Statements
1. AB
BC
DC
Reasons
1. Given
BC
2.
B is a right angle
C is a right angle
10.1 notes
Monday, February 23, 2009
2:19 PM
Definition:
1. A circle is the set of points in a plane that are a given distance
from a given point in the plane. The given point is the center of
the circle, and the given distance is the radius.
B
radius
Cen
9.1 and 9.2
Tuesday, January 27, 2009
1:12 PM
Introduction to circles
C=D or C=2r
A= r2
Definitions
1. An arc is made up of two points on a circle and all the points
of the circle needed to connect those points by a single
path.
Short hand:
arc CD or CD M
1.1 Notes
Thursday, August 21, 2008
3:14 PM
Points: Points are name by using capital letters.
Example: Point D or Point E
D
E
F
The diagram above represents a line. Lines are made up of points and are straight. The arrow at
the end of the figure show that