It is: 7*7*7 = 343 cubic cm
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A 7-cm cube has a volume of 343 cm3
A cylinder with a diameter of 20 cm and a length of 7 cm has a volume of 2,199.11 cm3
A cube has 6 faces of equal area. Area of each face would then be: 294 / 6 = 49 cm2. Each face is a square with edge of length equal to square root of its surface: a = sqrt(49) = 7 cm. Volume of cube is V = a3. For a = 7 cm, it would be V = 343 cm3.
r = 5 cm (5.00100615 cm)
volume = length x width x height height = volume / (length x width) height = 378 cm3 / (6cm x 7cm) = 9 cm