Explanation:

- A triangle with sides 3 cm, 4 cm, and 5 cm is a right-angled triangle.

- To form a cone, we rotate the triangle around one of its perpendicular (height) sides.

- Cone 1 is formed by rotating around the 3 cm side. The 3 cm becomes the height (h), and the 4 cm side is the base radius (r).

- Volume \( V_1 = \frac{1}{3} \pi r^2 h = \frac{1}{3} \pi (4)^2 (3) = 16\pi \).

- Cone 2 is formed by rotating around the 4 cm side. The 4 cm becomes the height (h), and the 3 cm side is the base radius (r).

- Volume \( V_2 = \frac{1}{3} \pi r^2 h = \frac{1}{3} \pi (3)^2 (4) = 12\pi \).

- The volume ratio \( V_1:V_2 = 16\pi : 12 \pi = 4:3 \).

- Answer: Option 1 - 4:3

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