We can find area by calculating area of squre with side 27in minus area of square with side12in
I might be wrong.
I guess that in total all the angles equal to 180, that being said...
m∠BAC = 79
First list all the factors of 12;
1, 2, 3, 4, 6, 12
now let's see which ones are multiples of 3;
3, 6, 12
so all we have left are numbers 1, 2 and 4.
hope that helps, God bless!