Based on the given information, we can use the Pythagorean Theorem to find the height of the cone. The Pythagorean Theorem states that in a right triangle, the square of the hypotenuse (the side opposite the right angle) is equal to the sum of the squares of the other two sides.
In this case, the height (h) of the cone is one of the sides, and the slant height (13 cm) and the radius (half of the diameter, which is 10/2 = 5 cm) are the other two sides.
Using the Pythagorean Theorem, we have:
h^2 = (slant height)^2 - (radius)^2
h^2 = 13^2 - 5^2
h^2 = 169 - 25
h^2 = 144
Taking the square root of both sides, we get:
h = √144
h = 12 cm.
Therefore, the length of the height of the cone is 12 cm.