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If the sum of half of an acute angle, the remainder of the acute angle and the complement of the acute angle is equal to the horizontal angle, then the degree of the acute angle is zero______ °．
Let the acute angle be X. from the meaning of the question, we can get: x2 + 90 ° - x + 180 ° - x = 180 ° and the solution is: x = 60 °. So fill in 60 °
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