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ARTICLE
BOOK VIII.
TRI-DIMENSIONAL SPHERICS.
PAGE ARTICLE
605-609. Sphere, center, radius, defined, 239 | 626-630. Tangency.
Intersecting spheres.
PAGE
243, 244
240 633-639.
240 640, 641.
240, 241
245
Sphere and tetrahedron. 246-248
Globe and globe-segment de-
fined
248
241
Hemispheres
241 644.
625.
cles .
Zone and its bases defined.
242, 243 645, 646.
dron
Chords and arcs
metry
241 642, 643. Central and planar sym-
Globe equivalent to tetrahe-
248, 249
841. Space angle made by two planes. 333 849-851. Area of spherical triangle or