Using tan ( opp / adj )
2nd tan = 13 / 6
x = 65.22
to the nearest degree, it would be 65°.
To find volume, you do length * width * height, in this case they are all 27.
So 27 * 27 * 27 = 19,683
So the cube is 19,673 inches cubed.
A/B : 4/9 = 12/B
cross multiply
(4)(B) = (9)(12)
4B = 108
B = 108/4
B = 27
P = 4a...where a is the length of one side
P = 4(27)
P = 108 yds <=== perimeter of square B