Answer:





Step-by-step explanation:
Part 1) Find the measure of angle 1
we know that
-----> by supplementary angles

Part 2) Find the measure of angle 2
we know that
-----> by alternate exterior angles
Part 3) Find the measure of angle 3
we know that
-----> by vertical angles
Part 4) Find the measure of angle 4
we know that
------> by corresponding angles
Part 5) Find the measure of angle 5
we know that
-----> by vertical angles
so

Part 6) Find the measure of angle 6
we know that
-----> by supplementary angles
we have

substitute


Proportionally? Not sure. But here is a way to find out the value of x
50° + 2x+40 +4x+8 = 180°
Combine like terms
50°+ 6x + 48=180
(now subtract 50° from both sides)
6x + 48 = 130°
(now subtract 48 from both sides
6x=82°
x= 13.6666667° (repeating decimal)
Well look u can trust me at this im really good at it the answer is 43 trust me
90 degrees, it looks like a right angle
Hope it helps :))