A sphere is round - like a tennis ball. A torus is ring-shaped - like a donut !
A hemisphere is half a sphere
Sphere is whole a hemisphere is not
A sphere or torus (a donut).
Sphere, torus, moebius strip
A blob, an ellipsoid, a torus (doughnut), a sphere
Sphere is whole a hemisphere is not
A hemisphere is half a sphere
An ellipsoid, a sphere, a torus to name a few.
A sphere or torus (a donut).
A sphere is a whole, and a hemisphere is a part or half.
A sphere, an ellipsoid, a torus (donut), an irregular blob with no pointy bit.
A sphere, ellipsoid, torus (doughnut), and many more besides.
A blob, an ellipsoid, a torus (doughnut), a sphere
Sphere, torus, moebius strip
A sphere has 0 vortex and a cylinder has 2 faces
A sphere, a cone, a section of a sphere or ellipsoid, a torus (doughnut) sliced by a plane perpendicular to its axis, a paraboloid. These are some examples.
Topology is the study of objects (often surfaces in 3D) where details like position, shape and curvature are unimportant. Two topological objects are considered equivalent if they can be stretched to look like one another. An example of two different topological objects are a sphere and a doughnut shape (torus); the sphere cannot be stretched to look like the torus because it doesn't have a hole and the torus does.