The surface are of the new solid formed by the joining of two identical cubes having a surface area of 294 cm² is: 490 cm²
Total surface area of a cube = 6a², where a is the length of each of the sides.
Given:
Surface area of each identical cube = 294 cm²
Find the length of each side:
6a² = 294
a² = 294/6
a² = 49
a = √49
a = 7 cm
Surface area of the new solid = surface area of the two identical cubes - 2(area of the surface where both are joined)
Surface area of the new solid = 2(294) - 2(7²) = 490 cm²
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