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Mathematics 9 Online
OpenStudy (anonymous):

If angles ABC and CBD are supplementary angles; and angle ABC measures 123. What is the measurement of angle CBD? plz show work i need to know how to do this!!!

OpenStudy (jessicap):

Supplementary angles are two angles whose sum equals 180 degrees. Using this information, we can set up an equation x+123=180 where x is the unknown angle. Now all you have to do is solve! Subtract 123 from both sides to get x by itself, and you should get 57.|dw:1330638873092:dw|

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