Sewanhaka High School
Math 8
Class:________________
Name:________________________________
Mrs. Lidowsky, Principal
Mr. Long, Teacher
Date:_____________________
HW #47: Ditto
DO-NOW #47:
2) Write the first six letters of the alphabet
as capital letters. Which have line
symmetry?
3) Define TRANSFORMATION:
Topic: Transformations
Main Idea: Line Reflections
Aim:
RECALL
Locate ΔABC by plotting and connecting the
following points: A(1, 1) B(4, 1) C(3, 3)
Find the image of ΔABC under the reflection in
the x-axis. Give the coordinates of A’, B’, and C’.
Answer:
A(1, 1) →
B(4, 1) →
C(3, 3) →
Find the area of both figures.
Does either triangle have line(s) of symmetry? If
so, show where they are located.
NOTES
Page 2.
Locate DEFG by plotting and connecting the following
points: D(-2, 3) E(2, 3) F(2, 0) G(-2, 0)
Find its image under rx-axis. Give the coordinates of D’,
E’, F’, and G’.
Find the area of each
figure.
Answer:
D(-2, 3) →
E(2, 3) →
F(2, 0) →
G(-2, 0) →
Without graphing, find the coordinates of each point
under rx-axis.
Answer: (x, y) → (
A(2, 1) →
B(3, -2) →
C(-4, -2) →
D(-4, 2) →
,
)
E(-5, -5) →
F(1, 1) →
G(3, 0) →
H(x, y) →
Locate ABCD by plotting and connecting the
following points: A(-1, 2) B(-2, 0) C(-5, 0)
D(-4, 2)
Find the image of ABCD under a reflection in the
y-axis. Give the coordinates of A’, B’, C’, and D’.
Answer:
A(-1, 2) →
Find the area of each
B(-2, 0) →
figure.
C(-5, 0) →
D(-4, 2) →
Locate HIJ by plotting and connecting the
following points: H(1, 5) I(3, 5) J(3, 9)
Find the image of HIJK under a reflection in the
line y = x. Give the coordinates of H’, I’, and J’
Answer:
H(1, 5) →
I(3, 5) →
J(3, 9) →
Find the area of each figure.
Answer:
Question: Without graphing, find the coordinates of
each point under ry = x.
Answer: (x, y) →
I(3, 1) →
J(2, -4) →
K(-2, -4) →
L(-5, 2) →
M(10, 10) →
N(0, 4) →
P(4, 0) →
Q(x, y) →
Page 3.
Drill:
Locate HIJK by plotting and connecting the following
points: H(1, 2) I(4, 2) J(3, -1) K(0, -1)
Find the image of HIJK under a reflection in the y-axis.
Give the coordinates of H’, I’, J’, and K’.
Answer:
H(1, 2) →
I(4, 2) →
J(3, -1) →
K(0, -1) →
Find the area of each
figure.
Without graphing, find the coordinates of each point
under rx-axis.
Answer: (x, y) → (
I(3, 1) →
J(2, -4) →
K(-2, -4) →
L(-5, 2) →
,
)
M(10, 10) →
N(0, 4) →
P(4, 0) →
Q(x, y) →
Locate ABCD by plotting and connecting the
following points: A(4, 2) B(5, 0) C(8, 0)
D(7, 2)
Find the image of ABCD under a reflection in the
line y = x. Give the coordinates of A’, B’, C’, and
D’.
Answer:
A(4, 2) →
B(5, 0) →
C(8, 0) →
D(7, 2)→
Find the area of each figure.
Answer:
Summary: