Sewanhaka High School
Math 8
Class:______________
Name:___________________________________
Mrs. Lidowsky, Principal
Mr. Long, Teacher
Date:________________________
H.W. #60: Ditto
DO-NOW #60: Answer the following questions:
1) Refer to the picture at the right.
If a || b, mL 2 = (2x + 59)° and mL 8 = (9x – 11)°,
find x and find the measure of each angle.
1 2
4 3
a
5 6
8 7
2)
Solve for x:
3x – 40
2x + 10
3) Greg can walk 4 miles in 20 minutes. How long will it take (in minutes) him to walk 6 miles?
Topic: Geometry
Main Idea: Corresponding angles
Aim:
RECALL
NOTES
Let m<B = 130°, find the measure of all the other angles in the given picture.
t
r || s
a) m<A = b) m<B = c) m<7 = d) m<C =
A B
r
e) m<E =
f) m<8 = g) m<H = h) m<G =
7 C
E 8
H G
s
Now focus on angles A and E, 7 and H, B and 8, and C and
G. What do we call angles A and E? What do we call
angles 7 and H? What do we call angles B and 8? What do
we call angles C and G?
What do we notice about angles A and E? What do we
notice about angles 7 and H? What do we notice about
angles B and 8? What do we notice about angles C and G?
Refer to the above picture of r || s. Find the value of x if
m<A = (3x – 30)° and m<E = 30°.
b
(3x + 40)°
Refer to the picture at the left. In the accompanying diagram, AB || CD .
EF intersects parallel lines AB and CD at G and H. If m<EGB is (3x +
40)° and m<EHD = (6x – 17)°, what is the value of x?
(6x – 17)°
Drill: Answer the following questions: Show work:
1) Refer to the picture at the left. In the accompanying diagram, AB || CD .
EF intersects parallel lines AB and CD at G and H. If m<AGF is (3x - 10)°
(3x – 10)° G
and m<CHF = 80°, what is the value of x?
80°
2) Refer to the picture at the left. In the accompanying diagram, AB || CD .
EH intersects parallel lines AB and CD at G and F. If m<EFB is (2x + 10)°
and m<EGD = (x + 20)°, what is the value of x?
3) Refer to the picture at the left. In the accompanying diagram, AB || CD .
MN intersects parallel lines AB and CD at G and H. If m<BGN is (2x + 50)°
and m<NHD = (5x - 70)°, what is the value of x?
Summary: