SMOTD

Angles
Pre-Algebra
Lesson 7.2
Rays and Angles
Whadda ya know 'bout...

Rays
Angles
Review: Points, Lines, Points of Intersection
Points:
A
B
C
D
E
Review: Points, Lines, Points of Intersection
Lines:
AC

BC

CA

CB

CD CE
DC EC
AD

BE

DA

EB
Review: Points, Lines, Points of Intersection
Intersection:

C
Learn: What is a ray?
Line: extends forever in both directions

A

B

name:
AB
BA

Ray: Begins from an endpoint and extends forever
in one direction

A

B

name:
AB
Zayn, Harry, Louis, Liam, Niall
Angle: formed by two rays (sides) that share
the same endpoint (vertex)
Degrees of Angles

angles

Acute

Right

Obtuse

Less than 90o

90o degrees

Greater than 90o
http://www.youtube.com/watch?v=tqIki33mTgs
Name this:

TOILET
PORCELAIN THRONE
THE LOO
OVAL OFFICE

APPLE
FRUIT

"DROPPING KIDS
OFF AT THE POOL"

MR. ZITELLO

SPHERE

TEACHER

BREAKFAST

MAN
IN MATH, ANGLES HAVE
SEVERAL NAMES TOO
Way #1: Using Points

names:

names:
Way #2: Using the vertex
L
M
N
names:

names:
Way #3: Use a number
L
M
N
names:

names:
Trick Question: Which angle is

S?

If 2 or more angles share a vertex, you have to use
three letters OR a numerical to avoid confusion
Trivia
Questions
Trivia
Questions
Trivia
Questions
Trivia
Questions
Trivia
Questions
http://www.mathplayground.com/alienangles.html
Pre-Alg 7.2 Rays and Angles

Pre-Alg 7.2 Rays and Angles