Changes

[[Image:Ghdyt.png|right|thumb|300px]]

[[Image:Ghdyt.png|right|thumb|300px]]

A '''Torus''' is the mathematical term for a “[[doughnut]]-like” shape created by rotating a [[circle]] around the [[x-axis]].   

A '''torus''' is the mathematical term for a “[[doughnut]]-like” shape created by rotating a [[circle]] around the [[x-axis]].   

If the “inner [[radius]]” (the width of the doughnut hole) is R, and the radius of the circular cross-section is r, then, the [[surface area]] of the torus is

If the “inner [[radius]]” (the width of the doughnut hole) is R, and the radius of the circular cross-section is r, then, the [[surface area]] of the torus is

[[Category:Geometry]]

[[Category:Geometry]]