Question

Given the following diagram, find the required measures.

Given: l | | m

m 1 = 120°
m 3 = 40°

m 4 =

50
120
140
3

Answer 1

do you notice what <3 and < 4 form ?

Answer 2

angle 3 and angle 4 add up to a straight line
How many degrees is a straight line ?

Answer 3

what do they form?

Answer 4

180

Answer 5

and if angle 3 is 40 what must angle 4 be so that their sum is 180?
or as an equation

40 + x = 180
what is x ?
add -40 to both sides to "solve for x"

Answer 6

okay, so is it 140?

Answer 7

yes

Answer 8

thank you sooo much