The surface area is 13.5 square inches.
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If it's 12 x 14 x 15, it's not a cube. The surface area of the object is 1116 square centimeters.
Each side measures 15. Divide the known surface area by 6... this gives you the area of one side. The square root of the area of one side will give you the length of each side.
If you are referring to a cube with 15mm sides then this is how you would work it out. A cube has 12 edges of the same length, and 6 faces of the same area. We know area is length^2 (length to the power of 2 / length X length. What you have to find is the total surface areo of all of the faces. If you can work out the area of one face you will know the area of the others. Since the area of one face is the area of one square, we can use the fomula length^2 which is also known as length X length. we also know in this instance the length of the square is 15mm. so we substitute 15 into the formula length X length: 15 X 15 =225 Square mm (we write square millimetres as we are refering to area [2 dimensions] But we have so far only worked out the area of one face. since there are 6 faces on a cube we multiply the area of one face by 6. So in this Case: 225 square mm X 6 =1350 square mm that is how you find the surface area of any cube.
A cone with a diameter of 15 and a slant height of 15 will have a total surface area of about 530.14 units2
Surface Area = 417.62123 units2