The surface area of the cube is 54 cm2. What is the length of its rib?
| September 16, 2021 | education
A cube is a regular polyhedron, each face of which is a square, and the edges are of the same length.
Its surface area is determined by the formula:
S = 6a². Provided that it is 54 cm², we find the length of its edge, based on this formula:
6а² = 54,
a² = 54: 6 = 9,
a = √9 = 3 cm.
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