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Books Books 21 - 30 of 76 on In any triangle, the sum of the three angles is equal to two right angles, or 180°..
" In any triangle, the sum of the three angles is equal to two right angles, or 180°. "
Introduction and books 1,2 - Page 218
by Euclid, Sir Thomas Little Heath, Johan Ludvig Heiberg - 1908
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Annual Report of the Controllers of the Public Schools of the ..., Volumes 31-34

Education - 1849
...greater angle ; and conversely, the greater angle is opposite to the greater side. 2. In every triangle the sum of the three angles is equal to two right angles. 3. Two equal chords are equally distant from the centre ; and of two unequal chord«, the less is at...
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Elements of Geometry and Trigonometry Translated from the French of A.M ...

Charles Davies, Sir David Brewster, Adrien Marie Legendre - Trigonometry - 1849 - 359 pages
...to BAC: hence, DEH + BAC is equal to two right angles. PROPOSITION XXV. THEOREM. In every triangle the sum of the three angles is equal to two right angles. Let ABC be any triangle : then will the angle C + A + B be equal to two right angles. For, produce...
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Elementary Geometry: With Applications in Mensuration

Charles Davies - Geometry - 1850 - 216 pages
...of the two angles, A and C, is equal to the outward angle CBD (Ax. 1). THEOREM XVII. In any triangle the sum of the three angles is equal to two right angles. Let ABC be any triangle : then will the sum of the three angles C A+B+C=two right angles. For, let...
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ELEMENTARY GEOMETRY, WITH APPLICATIONS IN MENSURATION.

CHARLES DAVIS, L.L. D. - 1850
...of the two angles, A and C, is equal to the outward angle CBD (Ax. 1). THEOREM XVII. In any triangle the sum of the three angles is equal to two right angles. Let ABC be any triangle: then will the sum of the three angles C A-{-B-}-C=z two right angles . For,...
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A Manual of Surveying for India, Detailing the Mode of Operations on the ...

Sir Henry Edward Landor Thuillier - Surveying - 1851 - 718 pages
...triangle, if either acute angle be taken from 90°, the remainder will express the other acute angle. 4. The sum of the three angles is equal to two right angles. 5. The greater side is opposite the greater angle, and the less side to the less angle. 6. The sum...
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ELEMENTS OF GEOMETRY AND TRIGONOMETRY

A. M. LEGENDRE - 1852
...to BAC: hence, DEH '+ BAC is equal .to two right angles. PROPOSITION XXV. THEOEEM. In every triangle the sum of the three angles is equal to two right angles. Let ABC be any triangle : then will the sum of the angles 0+A+B be equal to two right angles. For,...
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Elements of Geometry and Trigonometry: From the Works of A.M. Legendre ...

Charles Davies, Adrien Marie Legendre - Geometry - 1854 - 432 pages
...equal to BAC: hence, DEH+BAC is equal to two right angles. PROPOSITION XXV. THEOREM. In every triangle the sum of the three angles is equal to two right angles. Let ABC be any triangle : then will the sum of the angles C+A+B be equal to two right angles. For,...
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Plane and Solid Geometry: To which is Added Plane and Spherical Trigonometry ...

George Roberts Perkins - Geometry - 1860 - 443 pages
...as many right angles as the polygon has sides, wanting four right angles. Cor. I. In any triangle, the sum of the three angles is equal to two right angles. x Cor. II. If one angle of a triangle is a right angle, as in the case of a right-angled triangle (D....
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Humanics

Thomas Wharton Collens - Psychology - 1860 - 358 pages
...on the track, and could not have secured it. Take, for instance, the theorem : " In every triangle the sum of the three angles is equal to two right angles," and see how many different facts must be brought to bear, and how many distinct definitions, axioms,...
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Elements of Geometry and Trigonometry: With Practical Applications

Benjamin Greenleaf - Geometry - 1862 - 490 pages
...and opposite angles CAB, ABC (Art. 34, Ax. 2). PROPOSITION XXVIII. — THEOREM. 95. In every triangle the sum of the three angles is equal to two right angles. Let ABC be any triangle ; A then will the sum of the angles ABC, BCA, CAB be equal to two right angles....
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