Posted by nikki on Thursday, September 30, 2010 at 12:34am.
How to solve: the measure of an angle is 12 less than twice the measure of its supplement. What is the measure of the angle?

Geometry  Kyle Buchanan, Thursday, September 30, 2010 at 2:29am
x + (2x  12) = 180
3x  12 = 180
3x = 180
+ 12
____
3x =192
192/3= x 
Geometry  Reiny, Thursday, September 30, 2010 at 8:57am
let the angle be x
then its supplement is 180x
x = 2(180x)  12
x = 360  2x  12
3x = 348
x = 116
check:
if the angle is 116
its supplement is 64
twice the supplement is 128
12 less than twice the supplement = 12812 = 116
YEAH!