The two angles sum to 180 degrees. So if one is 78, the other is 102.
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63 degrees because 180 -39 -78 = 63
The TWO (not one) missing angles are 102 and 70
yes it is
An angle of 78 degrees is an acute angle because it is greater than 0 but less than 90 degrees.
78 is an acute angle as it is less than 90, 144 is an obtuse angles as it is between 90 and 180