That is 2015! or 2015 factorial
that is big
not sure if a joke but the answer is (see attachment)
or about 1.15369522906899370...*10⁵⁷⁸⁶ in scientific notation
It's a equilateral triangle with each side being equal to the radius.
So the area is
Surface Area of Cube = width^2 * 6 (sides of the cube)
Therefore, (3.5)^2 * 6 =
73.5 [whatever units]^2