The Perimeter
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If a cube measures 5 inches on an edge, then each face of that cube is a square measuring 5 inches by 5 inches, having an area of 25 square inches.
Each face of a cube is a square. You simply square the length of each edge to find the area of the face. In this case, 4 inches squared = 4 x 4 which gives you 16 square inches per face.
Assuming your cube is actually a cube, each plane (face) would be 36 square inches. Multiply by six for your total surface area.
If the length of each edge of the cube is 's',then the area of each face is s2.
Each face of the cube has 1/6 of the area = 78/6 = 13 in2 .Each side of the face = square root of the area = sqrt(13) inches .The volume of the cube is (side length)3 = [ sqrt(13) ]3 = 46.872 in3 (rounded)