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To calculate the curved surface area of the cone, we need to find the slant height of the cone first. We can use the Pythagorean theorem to do this:
Slant Height (l) = √(r^2 + h^2)
= √(4^2 + 3^2)
= √(16 + 9)
= √25
= 5 cm
Now, we can calculate the curved surface area of the cone:
Curved Surface Area = πrl
= π * 4 * 5
= 20Ï€ cm^2
Therefore, the curved surface area of the cone is 20Ï€ cm^2.