In the figure, the area of square WXYZ is 25cm2. The four smaller squares have sides 1 cm long, either parallel to or coinciding with the sides of the large square. In ΔABC, AB=AC, and when ΔABC is folded over side BC, point A coincides with O, the center of square WXYZ. What is the area of ΔABC, in square centimeters?[asy]
defaultpen(fontsize(8));
size(225);
pair Z=origin, W=(0,10), X=(10,10), Y=(10,0), O=(5,5), B=(-4,8), C=(-4,2), A=(-13,5);
draw((-4,0)--Y--X--(-4,10)--cycle);
draw((0,-2)--(0,12)--(-2,12)--(-2,8)--B--A--C--(-2,2)--(-2,-2)--cycle);
dot(O);
label("A", A, NW);
label("O", O, NE);
label("B", B, SW);
label("C", C, NW);
label("W",W , NE);
label("X", X, N);
label("Y", Y, N);
label("Z", Z, SE);
[/asy]<spanclass=′latex−bold′>(A)</span>415<spanclass=′latex−bold′>(B)</span>421<spanclass=′latex−bold′>(C)</span>427<spanclass=′latex−bold′>(D)</span>221<spanclass=′latex−bold′>(E)</span>227