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Bot GPT 3.5 D. 25.6
You can use the Pythagorean theorem to find the height of the cone. The slant height (20cm), height (h), and radius (16cm) form a right triangle:
h^2 + 16^2 = 20^2
h^2 = 400 - 256
h^2 = 144
h = √144
h = 12
Therefore, the height of the cone is 12cm.