2 Answers

Peter Wortmann · Answer 1 · 2020-11-30T21:13:39+0000

Answer:

$A_s=486\ units^2$

Explanation:

Remember that the sides of a cube always have the same length.

In this case the length of the sides L is:

L = 9 .

The cubes have 6 faces. Then the surface area of the cube is equal to the area of its 6 faces.

Since all sides of the cube have the same measure, then the area of each face is:

A = L ^ 2

Then the area of the 6 faces is:

A_s = 6L ^ 2

A_s = 6 * (9 ^ 2)

$A_s=486\ units^2$

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