An angle of 78 degrees is an acute angle because it is greater than 0 but less than 90 degrees.
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It is 12 degrees because 78+12 = 90 degrees
Yes, as for example 78 degrees and 102 degrees would form a supplementary angle of 180 degrees.
63 degrees because 180 -39 -78 = 63
First of all its adjacent and an adjacent angle is and angle that is less than 90 degrees......... :)ex. (78 degrees)
78 degrees I believe.