It is 10o less than a 90o angle. It has a very steep slope.
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180-100=80 degree angle
An 80 degree angle is an acute angle. Any angle measurement that falls below 90 is acute while anything above is obtuse.
Angles can be complementary. A 100 degree angle is a complementary angle to an 80 degree angle in geometry studies.
An acute angle.
20 degrees.