Question

The circle shown below has AB and BC as its tangents.

If the measure of arc AC is 140°, what is the measure of angle ABC?

Answer 1

a. 60°
b. 40°
c. 70°
d. 50°

Answer 2

60

Answer 3

Are you sure? how did you get that? thank you!

Answer 4

@dutchman1bdo still there? :)

Answer 5

a and c both equal 6

Answer 6

a is 60 and c is 70

Answer 7

?

Answer 8

60 was marked wrong :(

Answer 9

Answer: B. 40

Answer 10

How did you get that?

Answer 11

Sum of angles in a cyclic quad = 360 deg. Since AB & BC are tangents to the circle, angles A and C are each 90 deg. So, angle ABC = 40 deg.