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" The sum of the two acute angles of a right triangle is equal to one right angle, or 90°. "
A TREATISE ON PLANE AND SPHERICAL TRIGONOMETRY. - Page 15
by WILLIAM CHAUVENET - 1855
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Exercises in Arithmetic

George Albert Wentworth, George Anthony Hill - Arithmetic - 1887
...AB, BO, which form the right angle, are called the legs, and the side AC is called the hypotenuse. The sum of the two acute angles of a right triangle is equal to one right angle, or 90°. If one of the acute angles is equal to 30°, the opposite side is...
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Arithmetic

George Albert Wentworth, George Anthony Hill - Algebra - 1892 - 296 pages
...AB, BC, which form the right angle, are called the legs, and the side AG is called the hypotenuse. The sum of the two acute angles of a right triangle is equal to on« right angle, or 90°. If one of the acute angles is equal to 30°, the opposite side...
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"Wentworth & Hill's Exercise Manual: Arithmetic, Volume 1

George Albert Wentworth, George Anthony Hill - 1894
...AB, BC, which form the right angle, are called the legs, and the side AG is called the hypotenuse. The sum of the two acute angles of a right triangle is equal to one right angle, or 90°. If one of the acute angles is equal to 30°, the opposite side is...
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A Treatise on Elementary Geometry: With Appendices Containing a Collection ...

William Chauvenet - Geometry - 1896 - 368 pages
...angle is the quotient of the hypotenuse divided by the adjacent side. Thus sec .4 = 4» 8ec B = о а 18. The COSINE, COTANGENT, and COSECANT of an angle,...the preceding definitions, we shall have sin A = cos В = — cos A = sin В = — с с tan А =« cot В = — cot A = tan В = — ba sec A = cosec В...
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Wentworth & Hill's Exercise Manuals: Arithmetic, Issue 1

George Albert Wentworth, George Anthony Hill - Mathematics - 1896 - 282 pages
...AB, BO, which form the right angle, are called the legs, and the side AC is called the hypotenuse. The sum of the two acute angles of a right triangle is equal to one right angle, or 90°. If one of the acute angles is equal to 30°, the opposite side is...
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Wentworth & Hill's Examination manuals: Arithmetic, Issue 1

George Albert Wentworth, George Anthony Hill - Mathematics - 1897
...AB, BC, which form the right angle, are called the legs, and the side AC is called the hypotenuse. The sum of the two acute angles of a right triangle is equal to ono right angle, or 90°. If one of the acute angles is equal to 30°, the opposite side is...
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Elements of Geometry

George Washington Hull - Geometry - 1897 - 398 pages
...angles. 52. COR. 4.—A triangle cannot have two right angles, nor two obtuse angles. 53. COR. 5.— The sum of the two acute angles of a right triangle is equal to one right angle. PROPOSITION XVIII. THEOREM. 55. Two triangles are equal when two sides and...
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Myers Arithmetic: Book I-[III], Book 3

George William Myers - Arithmetic - 1908
...inches in diameter. The specific gravity of cast iron is 7.2. Find the weight of the cast iron ring 108. The sum of the two acute angles of a right triangle is 90°. The acute angles are to each other as 1:2. Find them. HINT: Call one angle, x, and the other...
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A Text-book on Advanced Algebra and Trigonometry, with Tables

William Charles Brenke - Algebra - 1910 - 343 pages
...23. tan Л and cot Л may have any value from 0 to oo . 128. Functions of Complementary Angles. — Since the sum of the two acute angles of a right triangle is 90°, they are complementary. By definition, we have . „ opp. side b sin В = -*vf = hyp. с cos...
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Myers Arithmetic for Grammar Schools

George William Myers - Arithmetic - 1912 - 402 pages
...iron is 7.2 times as heavy as an equal volume of water. Find the weight of the cast-iron ring. 86. The sum of the two acute angles of a right triangle is 90°. The acute angles are to each other as 1:2. Find the angles. Call one angle, x, and the other...
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