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Books Books 11 - 20 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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Elements of Geometry and Trigonometry

Adrien Marie Legendre - Geometry - 1836 - 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 an- R glc C + A + B be equal to two right angles. For, produce...
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Elements of geometry

Adrien Marie Legendre - Mathematics - 1841 - 235 pages
...measure of the three angles of the triangle a'c'b', reduces itself to 2 D ; therefore, in any triangle, the sum of the three angles is equal to two right angles. 58. Corollary i. Two angles of a triangle being given, or only their sum, the third will be known by...
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Pantology: Or, A Systematic Survey of Human Knowledge; Proposing a ...

Roswell Park - Best books - 1841 - 587 pages
...the greater angle : and either side is always less than the sum of the other two. In every triangle, the sum of the three angles is equal to two right angles, or 180. When two triangles have the angles of the one equal to the corresponding angles of the other,...
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Arithmetical Spyglass and Teacher's Assistant: Intended as a Key and ...

Charles Waterhouse - Arithmetic - 1842 - 166 pages
...triangle, that is the greater which is opposite to the greater side. , 4. In every triangle, the sum of the three angles is equal to two right angles ; in a square, there are four right angles, 5. The sum of all the interior angles of a polygon, is...
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Elementary and practical arithmetic on the inductive system, by analysis and ...

Charles Waterhouse - Arithmetic - 1844 - 216 pages
...very unequal. PRINCIPLES. 1. In a square there are four right angles, or 360. 2. In every triangle, the sum of the three angles is equal to two right angles. -3. In an isosceles triangle, the angles opposite to the equal sides are equal. 4. The sum of all the...
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Elements of plane (solid) geometry (Higher geometry) and trigonometry (and ...

Nathan Scholfield - 1845
...the three angles of the triangle ABC make up the same sum as the three angles CAB, BAE, EAD ; hence, the sum of the three angles is equal to two right angles (Prop. III.) Cor. 1. Two angles of a triangle being given, or merely their sum, the third will be found...
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The New American Practical Navigator; Being an Epitome of Navigation ...

Nathaniel Bowditch - 1846 - 451 pages
...the sum of the two angles EFG and EGF, and at the same time / XXXV. In any right-lined triangle, ABC, the sum of the three angles is equal to two right angles. To prove this, you must produce BC (in the fig. Art. 33) towards D; then(byw3rf.33), the external angle...
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A complete treatise on practical land-surveying, in all its departments ...

Anthony Nesbit - Technology & Engineering - 1847 - 426 pages
...properties. 1. The greatest side is opposite the greatest angle, and least side opposite the least angle. 2. The sum of the three angles is equal to two right angles, or 180. 3. If one angle be given, the sum of the other two is found by subtracting the given angle...
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Pantology; or, A systematic survey of human knowledge

Roswell Park - 1847
...the greater angle : and either side is always less than the sum of the other two. In every triangle, the sum of the three angles is equal to two right angles, or 180. When two triangles have the angles of the one equal to the corresponding angles of the other,...
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Natural Philosophy for Schools, Families, and Private Students

Mrs. Lincoln Phelps - Physics - 1848 - 288 pages
...see a triangle marked out before us, and it is demonstrated by a train of geometrical reasoning, thai the sum of the three angles is equal to two right angles, we are as perfectly certain of the fact as if it had been proved by actual measurement. 22. Difference...
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