Sewanhaka High School
Mrs. Lidowsky, Principal
Math 8
Mr. Long, Teacher
Class:______________
Date:________________________
Name:___________________________________
H.W. #54: Ditto
DO-NOW #54: Answer the following questions:
4) Gautam pays $5 a month plus $0.10 a minute for long distance service. If his
monthly bill is $12.20, how many minutes was he charged for?
Topic: Transformations
Main Idea: Congruent Triangles
Aim:
Take
out a sheet of looseleaf paper and fold it at a
RECALL
diagonal from one corner to another. Cleanly tear it
at the diagonal. What figures are formed and what
do you notice about those figures?
NOTES
What can we say about congruent triangles?
ΔABC  ΔDEF
A
B
F
C
E
Name all the corresponding
sides and corresponding
angles that match up.
D
STATEMENT: Two triangles are congruent when all of the corresponding parts are congruent
meaning sides and angles. However, you do not need to know that all six corresponding parts
are congruent. Sometimes you only need to know that three of the six corresponding parts are
congruent.
Refer to the previous triangles, ΔABC  ΔDEF.
Determine which transformations map ΔABC onto ΔDEF
Which pair of triangles is congruent? Write a congruence statement for the pair that is congruent and write why the
triangles are congruent. For the pair of triangles that are congruent, determine which transformation(s) map the one
triangle onto the other.
OR B)
A)
G P
I
H
Q
R
Drill: For exercises 1 and 2, determine whether each pair of triangles is congruent. If so, write a congruence statement, tell
why the triangles are congruent, and determine which transformation(s) map the one triangle onto the other.
Work and Answers for #:
1)
SUMMARY:
If time:
2)
3)