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" The sum of the angles of a spherical triangle is greater than two and less than six right angles ; that is, greater than 180° and less than 540°. (gr). If A'B'C' is the polar triangle of ABC... "
A Treatise on Elementary Geometry: With Appendices Containing a Collection ... - Σελίδα 263
των William Chauvenet - 1872 - 368 σελίδες
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A treatise on navigation, and nautical astronomy

Edward Riddle - 1824 - 551 σελίδες
...measure of D, and В С the supplement of the measure of F. PROPOSITION VIII. The sum of the interior angles of a spherical triangle is greater than two, and less than six right angles. For (see last figure) the measures of the angles А, В, С, in the triangle ABC, together with the three...

Solutions of the Cambridge Problems: From 1800 to 1820, Τόμος 2

John Martin Frederick Wright - 1825
...1816. SPHERICAL TRIGONOMETRY. 1. EVERY plane section of a sphere is a circle. 2. The sum of the three angles of a spherical triangle is greater than two, and less than six, right angles. 3. The angles of a spherical triangle are А, В, С ; the sides respectively opposite to them, (а),...

Alma mater; or, Seven years at the University of Cambridge. By a Trinity-man ...

John Martin F. Wright - 1827
...COLLEGE. SPHERICAL TRIGONOMETRY. 1. EVERY plane section of a sphere is a circle. 2. The sum of the three angles of a spherical triangle is greater than two, and less than six, right angles. 3. The angles of a spherical triangle are A, B, C ; the sides respectively opposite to them, io), i/l),...

Alma Mater, Or, Seven Years at the University of Cambridge, Τόμος 1

John Martin Frederick Wright - 1827
...COLLEGE. SPHERICAL TRIGONOMETRY. 1. EVERY plane section of a sphere is a circle. 2. The sum of the three angles of a spherical triangle is greater than two, and less than six, right angles. 3. The angles of a spherical triangle are A, B, C; the sides respectively opposite to them, (a), (b),...

The London Encyclopaedia: Or, Universal Dictionary of Science, Art ..., Τόμος 10

Thomas Curtis - 1829
...of D, and В С the supplement of the measure of F. THEOREM XCI. — TKè sum of the interior augles of a spherical triangle is greater than two, and less than six right angles. For (fig. 106, p. III.) the measures of the angles А, В, С, together with the sides of the supplemental...

Elements of Spherical Trigonometry

Augustus De Morgan - 1833 - 32 σελίδες
...asserted. (B.) The greater angle of a spherical triangle is opposite, to the. greater side, and the mm of the angles of a spherical triangle is greater than two and Ins than six right angles. Also lhe sum of any two angles is less than the. third increased by 180°....

Library of Useful Knowledge: Geometry, plane, solid, and spherical [by ...

1835
...proposition asserted. (B.) The greater angle of a spherical triangle is opposite, to the greater side, and the sum of the angles of a spherical triangle is greater than two and less than six right angles. Also the sum of any two angles is less than the, third increased by 180°. The first part appears from...

The elements of plane trigonometry, Τόμος 1

John Charles Snowball - 1837
...triangle, V+6'>c'; .-. (тг- А) + (тг-B)>(ж-С); .: тг>A + B-С. Or, A + B - С < тг. 21. The sum of the angles of a spherical triangle is greater than two, and less than six, right angles. Let A, B, С be the angles, and a, b, с the sides of a triangle; A', B', C' and a', 6', c, the angles...

An Elementary Treatise on Plane and Solid Geometry

Benjamin Peirce - 1837 - 159 σελίδες
...— c; and the sides of the polar triangle ISO° — ,4, 180° — B, 180° — C. \ 447. Theorem. The sum of the angles of a spherical triangle is greater than two right angles. Demonstration. Let A, B, C be the angles of the spherical triangle. The sides of its...

Elementary Course of Geometry ...

Charles William Hackley - 1847 - 103 σελίδες
...Astronomy, which, as a science of observation, depends entirely on angular measurements. PROP. XIV. The sum of the angles of a spherical triangle is greater than two and less than six right angles, For each angle is less than two (note to Prop. 8), hence the sum of the three is less than six right angles....




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