Hart, C. A. (Clara Avis), b. 1863, Feldman, Daniel D., b. 1872 · New York, American Book Co · leaf 447
tuse angle, a spherical triangle may have one,two, or three right angles or one, two, or three obtuse angles (§ 950). If the student will recall that, considering the earth as a sphere, thenorth and south poles of the earth are the poles of the equator, and thatall meridian circles are great…
Geometry, Plane · Geometry, Solid
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