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No 3D shape has only three sides to be a complete unit.

If a 3D shape has a side which is curved, it has more than three sides, because any curve on a 3D object is an infinite number of sides.

Think of it like if you had a million sided 2D object. From a distance, it would look like a circle, but mathematically, you can't have a perfect circle.

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Q: What 3D shape has 3 surfaces but 1 is curved?
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