Find the length of the diagonal of the prism. The lengths are 12, 3, and 4

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

Let the length of the diagonal be "d".
Using the Pythagorean theorem, we have:

d² = 12² + 3² + 4²
d² = 144 + 9 + 16
d² = 169

Taking the square root of both sides, we get:

d = √169
d = 13

Therefore, the length of the diagonal of the prism is 13.