pre-alg 7.2 rays and angles
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Pre-Algebra
Lesson 7.2
Rays and Angles
SMOTDAngles
Rays
Angles
Whadda ya know 'bout...
Review: Points, Lines, Points of Intersection
Points:
A
B
C
D
E
Review: Points, Lines, Points of Intersection
Lines:
AC
CA
CD
DC
AD
DA
BC
CB
CE
EC
BE
EB
Review: Points, Lines, Points of IntersectionIntersection:
C
Learn: What is a ray?
Ray: Begins from an endpoint and extends forever in one direction
A B
Line: extends forever in both directions
A B
name:
name:
AB
BA
AB
Zayn, Harry, Louis, Liam, Niall
Angle: formed by two rays (sides) that share the same endpoint (vertex)
Degrees of Angles
Less than 90o 90o degrees Greater than 90o
angles
Acute Right Obtuse
http://www.youtube.com/watch?v=tqIki33mTgs
Name this:
APPLE
FRUIT
SPHERE
BREAKFAST
TOILET
PORCELAIN THRONE
THE LOO
OVAL OFFICE
"DROPPING KIDS OFF AT THE POOL"
MR. ZITELLO
TEACHER
MAN
IN MATH, ANGLES HAVE SEVERAL NAMES TOO
names:
Way #1: Using Points
names:
names:
Way #2: Using the vertex
names:
L
M
N
names:
Way #3: Use a number
names:
L
M
N
If 2 or more angles share a vertex, you have to use three letters OR a numerical to avoid confusion
Trick Question: Which angle is S ?
Trivia
Questions
Trivia
Questions
Trivia
Questions
Trivia
Questions
Trivia
Questions
http://www.mathplayground.com/alienangles.html