AHSME 1995 Problem 10

The area of the triangle bounded by the lines $y = x, y = - x$ and $y = 6$ is $\mathrm{(A) \ 12 } \mathrm{(B) \ 12\sqrt{2} } \mathrm{(C) \ 24 } \mathrm{(D) \ 24\sqrt{2} } \mathrm{(E) \ 36 }$