Calculate Total Edge Length: Cube with 6.5 cm Sides

Given the cube and the length of each edge equals 6.5 cm

What is the sum of the lengths of the edges of the cube?

To solve this problem, we need to find the total length of all the edges of a cube where each edge measures 6.5 cm. A cube has 12 edges, and the length of each edge is identical.

We'll apply the formula for the sum of the lengths of the edges of a cube:

• Formula: Total edge length = $12 \times \text{edge length}$

Substitute the given edge length into the formula:

Total edge length = $12 \times 6.5$.

Now let's do the calculation:

Total edge length = $12 \times 6.5 = 78$.

Therefore, the sum of the lengths of the edges of the cube is $\mathbf{78}$ cm.

The correct choice from the given options is choice 4, which corresponds to the result of $78$.