Two angles are supplementary. The larger angle is 140 degrees ​ ​​ larger than the smaller angle. Find the measure of both angles?

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legna Share
Mar 8, 2018


140 and 40


If two angles are supplementary that means they add up to 180 degrees. Supplementary is commonly confused with complementary angles which means that the two angles add up to 90 degrees. An easy way to remember the difference is that the S in supplementary is basically two C's together so imagine C as being half of S ( S is 180 while C is half, so 90)

If two angles add up to 180 and one is 140 then either subtraction or simple algebra will do. #180-140=40# or #140 + x= 180# and solve for x.

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