In geometry, a circle is a two-dimensional object, so it does not have a surface. Only three-dimensional objects have surfaces. A disc is a flat, circular three-dimensional object.
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It is a cylinder which looks like a tin can.
There are zero diagonals in a circle because a circle has no sides no vertices or it doesn't have a flat surface so zero.
It does not have a flat surface.
circle
The surface area is the area of every face of a 3D object, such as a cube or sphere. Area usually refers to a flat object, such as a circle or rectangle.