Sewanhaka High School
Math 8
Class:______________
Name:___________________________________
Mrs. Lidowsky, Principal
Mr. Long, Teacher
Date:________________________
H.W. #57: Ditto
DO-NOW #57: Answer the following questions:
1) <ABD is a right angle. Find the
2) <FAN is a straight angle. Find
m<ABC and m<CBD. What type of the m<FAR and m<RAN. What
angles are <ABC and <CBD and
type of angles are <FAR and <RAN
why?
and why?
3) Refer to the picture below. Lines
AB and CD intersect at E. Find the
measure of each angle. What type of
angles are <AEC and <DEB and
what type of angle are <CEB and
<AED and why?
Topic: Geometry with Algebra
Main Idea: Perpendicular and Parallel Lines
Aim:
(
) wants to get to the Justin Beiber concert at the Nassau coliseum by using HER SHS bus. SHE travels down New Hyde Park
road and wants to get to the Nassau Coliseum by way of Hempstead Turnpike.
RECALL
NOTES
1) Which way will she have to turn and what type of
angle will she have made?
2) Before she makes the turn onto Hempstead
Turnpike, she has to be traveling straight down NHP
Road. What type of angle does the Road form?
3) What do you call two lines that intersect and form
four right angles?
4) Draw two perpendicular lines with a ruler or
protractor and label them.
5) With your protractor draw two lines that intersect
at an angle of 30o. Label the lines AB and CD. Label
the point of intersection E. mL AEC = 30o. Find mL
CEB, mL BED.
6) Which angles are equal to each other? What do
we call these angles and why?
7) Which angles are next to each other? What type of
angles are they called?
NOTES
RECALL
8) What do you call two lines that never
intersect?
9) Draw two parallel lines with a ruler or
protractor and label them.
10) What is a tranversal?
NOTES: When two lines are cut by a transversal,
eight angles are formed, 4 interior angles and 4
exterior angles.
Define: 1) interior angles:
a
1 2
4 3
2) exterior angles:
b
5 6
8 7
If a || b, mL 1 = 140, find all other angles.
Drill:
1) In the figure, p || q and m<1 = 85º. Find:
l
81
72
6 3
5 4
a) m<3
b) m<7
c) m<1
e) m<2
f) m<6
g) m<4
d) m<8
p
h) m<5
q
Summary:
If time:
3)
h
r
k
4
3 5
2 6
1 7
8
In the figure at the left,
h || k and m<2 = 50º.
Find all missing
angles.
s
Refer to the figure at the
left. r || s
4) Find m<5 if m<7 = 95º
12
56
3 4
7 8
t
5) Find m<7 if m<4 =
110º