Calculate the total surface area and volume of a cube with a diagonal of 2√3 cm.
May 24, 2021 | education
| Let the side of the cube be equal to X cm.
Consider a right-angled triangle ABD, in which the legs AB and AD are equal to X cm, then, according to the Pythagorean theorem, the hypotenuse BD will be equal.
BD ^ 2 = AB ^ 2 + AD ^ 2 = X ^ 2 + X ^ 2 = 2 * X ^ 2.
BD = X * √2 cm.
Consider a right-angled triangle BB1D and which leg BB1 = X, and leg BD = X * √2.
Then, by the Pythagorean theorem, B1D ^ 2 = BB1 ^ 2 + BD ^ 2.
By condition, B1D = 2 * √3, then:
(2 * √3) ^ 2 = X ^ 2 + (X * √2) ^ 2.
12 = 3 * X ^ 2.
X ^ 2 = 4.
X = 2 cm.
The side of the cube is 2 cm.
Then the total area of the cube is:
Scuba = 6 * 2 * 2 = 24 cm2.
Answer: Scuba = 24 cm2.
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