None.
The cube have: -- six (6) faces -- twelve (12) edges -- zero (0) curved surfaces -- eight (8) vertices
it has 0 curved edges
One shape that has 12 edges is a cube. Any cuboid shape in general like a traditional cube or even an oblong can have 12 edges.
A cube has 12 edges.
In 3 dimensions, at least, a cube has no curved edges.
A cube
None.
The cube have: -- six (6) faces -- twelve (12) edges -- zero (0) curved surfaces -- eight (8) vertices
there are no curved edges on any triangle.
There are no curved edges in a pentagon. Part of the definition of any polygon is that they have straight edges.
In any cube, you can sort the edges into three sets, with 4 edges in each set. All four edges in a set are parallel to each other, and none of the edges in one set is parallel to any of the edges in any other set.
A sphere does NOT have any edges
there are 12 edges in a cube
it has 0 curved edges
it has 0 curved edges
If the figure has curved edges, then it's not a "rectangle".