How much foil is needed to cover the piece of chocolate?

9.84 in^2 
(3.5*1.2)/2*4.  or (3.5*1.2)*2+(1.2*1.2)=9.84

You need 18.24 square inches of foil to cover the chocolate

the area of the square on the bottom is 1.44 in^2
to find the area of 1 triangle do 1.2 times 3.5 = 4.2
to find the area of the 4 triangles multiply 4.2 by 4 to get 16.8 in^2

to find the total area of the figure (and the amt of tinfoil needed) add 16.8+1.44 to get 18.24 in^2