nsTeam1RO, nsTeam1RW, nsTeam1_talkRO, nsTeam1_talkRW
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[[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 tire-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