#1**+1 **

In a 30-60-90 right triangle, the side opposite the 30^{o} angle is equal to one-half the hypotenuse.

Since BC = 12' and BC is the side opposite the 30^{o} angle, the hypotenuse = 24'.

Also, the side opposite the 60^{o} angle is the length of the side opposite the 30^{o} angle times the square root of 3.

So, to find AC: 12 · sqrt(3).

geno3141 Apr 25, 2020