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In any triangle, the square of the side opposite an acute angle is equal to the sum of the squares of the other two sides, minus twice the product of one of these sides and the projection of the other side upon it.
Yale University Entrance Examinations in Mathematics: 1884 to 1898 - Page 190
1898 - 208 pages

## College Entrance Examination Papers in Plane Geometry

Geometry, Plane - 1911 - 192 pages
...Prove that in any plane triangle, the square of the side opposite an acute angle is equal to the sum of the squares of the other two sides minus twice the product of one of these sides by the projection of the other side upon it. Show what this theorem becomes when one of these latter...

## Elements of Plane Trigonometry

Daniel Alexander Murray - Plane trigonometry - 1911 - 158 pages
...from (1) by symmetry, viz. : In words: In any triangle, the square of any side is equal to the sum of the squares of the other two sides minus twice the product of these two sides multiplied by the cosine of their included angle. Relation (1) may be expressed as...

## Plane and Solid Geometry

Clara Avis Hart, Daniel D. Feldman - Geometry - 1912 - 504 pages
...side opposite an acute angle is equal to the sum of the squares of the other two sides diminished by twice the product of one of these sides and the projection of the other side upon it. Ex. 726. If the sides of a triangle are 7, "8, and 10, is the angle opposite 10 obtuse, right, or acute...

## Schultze and Sevenoak's Plane and Solid Geometry

Arthur Schultze, Frank Louis Sevenoak - Geometry - 1913 - 486 pages
...side opposite the obtuse angle is equal to the sum of the squares of the other two sides, increased by twice the product of one of these sides and the projection of the other side upon it. Given in A abc, p the projection of b upon c, and the angle opposite a obtuse. To prove a2 = 62 + c2...

## Schultze and Sevenoak's Plane Geometry

Arthur Schultze, Frank Louis Sevenoak - Geometry, Plane - 1913 - 328 pages
...side opposite the obtuse angle is equal to the sum of the squares of the other two sides, increased by twice the product of one of these sides and the projection of the other side upon it. Given in A abc, p the projection of b upon c, and the angle opposite a obtuse. To prove a 2 = ft 2...

## Plane and Solid Geometry, Suggestive Method

George Clinton Shutts - Geometry - 1913 - 494 pages
...theorem may be stated in general as follows: The square of any side of a triangle equals the sum of the squares of the other two sides minus twice the product of one of those sides and the projection of the other upon it. NUMERAL RELATIONS C, MA Given a A with sides a,...

## Constructive Text-book of Practical Mathematics, Volume 3

Horace Wilmer Marsh - Mathematics - 1914 - 272 pages
...trigonometry. V THEOREM 15 The square of the side opposite an acute angle of any triangle equals the sum of the squares of the other two sides minus twice the product of one of the two and the projection of the other upon it. Express as an equation the value of the projection...

## Constructive Text-book of Practical Mathematics, Volume 4

Horace Wilmer Marsh - Mathematics - 1914 - 264 pages
...formulate the law. 110. Law of Cosines. In any plane triangle, the square of any side equals the sum of the squares of the other two sides, minus twice the product of the two into (times') the cosine of their included angle. CASE I. The Square of a Side Opposite an...