Hi,

Supplement of angle x is (180-x)  as 

ex:

The Supplement of a 20° angle is (180-20°)  as 20° + 160° = 180° 

Answer by Alan3354(69443)   (Show Source): You can put this solution on YOUR website!
 i am having trouble understanding how to find the measure of s supplementary angle. i understand it has to equal 180, but how do i figure out which angles need which numbers?

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"it" doesn't equal 180.

The sum of 2 supplementary angles = 180 degs

----

The supplement of angle A = 180 - A

If you know one angle, you subtract to find the other one.

 

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