Answer:
The angles are 39 and 51
Step-by-step explanation:
Let x be the unknown angle
x+12 is the complement
Complements add to 90
x+x+12 = 90
Combine like terms
2x+12 = 90
Subtract 12 from each side
2x+12-12 = 90-12
2x = 78
Divide by 2
2x/2 = 78/2
x =39
x+12 = 39+12
=51
