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Mathematics 9 Online
OpenStudy (anonymous):

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? a. 60° b. 40° c. 70° d. 50°

OpenStudy (anonymous):

OpenStudy (mertsj):

Subtract the small arc from the big arc and divide by 2

jimthompson5910 (jim_thompson5910):

hint: these angles are supplementary (ie they add to 180 degrees) |dw:1380163262920:dw|

OpenStudy (anonymous):

is it a?

jimthompson5910 (jim_thompson5910):

x+140 = 180 x = ???

OpenStudy (anonymous):

oh its b 40 thank you!

jimthompson5910 (jim_thompson5910):

correct, yw

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