Given the following diagram, find the missing measure.

given:

m∠2 = 50°, m∠1 =

a. 40
b. 50
c. 90
d. 130

ps. the first the pictures go where it says above, given:

the 8 in 8,420 is in the thousands place so it's value is 8 thousand.

the 8 in 6,870 is in the hundreds place so it's value is 8 hundred.

divide 8000 by 800 to find the answer:

8000 / 800 = 10

the 8 in 8,420 is 10 times greater than the 8 in 6,870