Page 19 - TB_5B
P. 19
Activity 3 Applications of Angles
1 . Lines l and m are parallel. Find the measure of the unknown angle.
a. Draw a line that is parallel to
lines l and m and passes through the
l 40 vertex of a and b.
100
l 40 a
60 n b
m m 60
Use the properties of alternate angles
to find the measures of a and b.
a = 40 , b = 60
Find the measure of the unknown
angle.
= a b = 40 + 60 = 100
b.
l 35
Ø
m 40
8
1 . Lines l and m are parallel. Find the measure of the unknown angle.
a. Draw a line that is parallel to
lines l and m and passes through the
l 40 vertex of a and b.
100
l 40 a
60 n b
m m 60
Use the properties of alternate angles
to find the measures of a and b.
a = 40 , b = 60
Find the measure of the unknown
angle.
= a b = 40 + 60 = 100
b.
l 35
Ø
m 40
8
