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.
A cone perhaps?
i don't know the answer so dont blame it on me. but by the way there is no shape with 3 surface and 1 curved dont say im wrong because i dont know if im right
Cone
Sphere, torus, moebius strip
A cone would fit the given description
Sphere
Its an Cylinder
A cone perhaps?
cylinder
cone
i don't know the answer so dont blame it on me. but by the way there is no shape with 3 surface and 1 curved dont say im wrong because i dont know if im right
A cone.
A cylinder
Cone
A cylinder.
cone
Sphere, torus, moebius strip