Those three numbers could be the lengths of the sides of a right triangle,
because the squares of two of them add up to the square of the third one.
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84 degrees 180-48-48 = 84
48 degreesis an acute angle that is greater than 0 but less than a right angle of 90 degrees.
84 degrees
84 degrees
48 is less than 90, so a 48 degree angle is an acute angle.