Mention628178
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| so:text | In the sum \sigma of the three angles of a triangle is greater than two right angles ; it can... be shown that this "spherical excess" is given by 2)\sigma - \pi = K \deltawhere \delta is the area of the spherical triangle and the angles are measured ins . Further, each full line is of finite length 2 \pi R, and any two full lines meet in two points—there are no parallels! (en) |
| so:isPartOf | https://en.wikiquote.org/wiki/Howard_P._Robertson |
| so:description | Geometry as a Branch of Physics (1949) (en) |
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Triples where Mention628178 is the object (without rdf:type)
| qkg:Quotation595559 | qkg:hasMention |
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