179.9999 degrees, with infinite 9's.
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Complementary angles total 180 degrees. So if the obtuse angle is 145 degrees, the acute angle is 35 degrees.
Well, not always. An obtuse angle is one that is greater than 90 degrees. Any inscribed angle that intercepts a major arc can be any measurement in which it intercepts.
A obtuse angle is called an obtuse angle because if obtuse means bigger in degrees and a right angle is 90 degrees than a obtuse angle must be over 90 degrees.
An 80 degree angle is an acute angle. Any angle measurement that falls below 90 is acute while anything above is obtuse.
110 degrees creates an obtuse angle.