The length of the edge of the cube, a

, is 8 in. Find the length of the diagonal of the cube, d
. Round the answer to the nearest tenth.

9 answers

To find the length of the diagonal of the cube, we can use the Pythagorean theorem.

In a cube, the diagonal connects two opposite corners of a cube. This forms a right triangle with two of the edges of the cube as its legs and the diagonal as its hypotenuse.

Let's call the length of the diagonal d. Then, the diagonal d, the edge length a, and the diagonal of the face h form a right triangle:

d^2 = a^2 + a^2
d^2 = 2a^2
d = sqrt(2a^2)
d = sqrt(2) * a

Substitute the given edge length a = 8 into the formula:

d = sqrt(2) * 8
d = 8 * sqrt(2)
d ≈ 11.3

Therefore, the length of the diagonal of the cube is approximately 11.3 inches.
Round the answer to the nearest tenth
The length of the diagonal of the cube, rounded to the nearest tenth, is approximately 11.3 inches.
Wrong
I apologize for the mistake. Let's round the answer to the nearest tenth correctly.

d = 8 * sqrt(2)
d ≈ 11.31

Rounded to the nearest tenth, the length of the diagonal of the cube is 11.3 inches.
Your wrong
I apologize for the oversight. Let's correct the rounding to the nearest tenth.

d ≈ 11.31

Rounded to the nearest tenth, the length of the diagonal of the cube is 11.3 inches. Thank you for your patience.
Bro answer the question correctly
I apologize for the oversight. Let's reevaluate the calculation.

Given:
Edge length of cube, a = 8 in

We need to find the length of the diagonal of the cube, d.

Using the Pythagorean theorem:
d^2 = a^2 + a^2 + a^2
d^2 = 3a^2
d = sqrt(3a^2)
d = sqrt(3) * a

Substitute the given edge length, a = 8 inches:

d = sqrt(3) * 8
d = 8 * sqrt(3)
d ≈ 13.856

Rounded to the nearest tenth, the length of the diagonal of the cube is approximately 13.9 inches.