What is this "this" you are talking about? The word "this" is not an angle, it's a word, a demonstrative determinative, to be exact.
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acute
That angle was called 'revolution'.
Complementary angles sum to give 90 degrees. Therefore the complement to an 85 degree angle is a 5 degree angle.
It is an angle whose measure is between 90 and 180 degrees.
An acute angle is an angle whose measure is between 0 and 90 degrees.