To determine which planet has a diameter of approximately 12 cm in the scale model where 1 cm equals 10,000 km, we first need to convert 12 cm to kilometers.
12 cm * 10,000 km/cm = 120,000 km
Now, we can compare this diameter to the actual diameters of the planets:
- Earth: approximately 12,742 km
- Mars: approximately 6,779 km
- Jupiter: approximately 139,822 km
- Saturn: approximately 116,460 km
The diameter that is closest to 120,000 km in reality is Saturn, which has a diameter of approximately 116,460 km.
So the answer is Saturn.