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" In any quadrilateral the sum of the squares of the four sides is equal to the sum of the squares of the diagonals, plus four times the square of the line joining the middle points of the diagonals. "
Mathematical Dictionary and Cyclopedia of Mathematical Science: Comprising ... - Page 480
by Charles Davies, William Guy Peck - 1857 - 592 pages
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The Elements of geometry [Euclid book 1-3] in general terms, with notes &c ...

Euclides - 1821 - 294 pages
...PROP, 11. THEOR, In every quadrilateral Jigure (ABCD) the sum of the squares of the sides is equal to the sum of the squares of the diagonals, plus four times the square of the fine (EF) joining the points of bisection of the did' gonals. .. 23. Join EA, ED. Then the sum of the...
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Elements of Geometry and Trigonometry

Adrien Marie Legendre - Geometry - 1852 - 436 pages
...perpendicular AD. Then, And, BE~DC Hence, by adding and observing that EB and EC are equal, we have Cor. 1. In any quadrilateral, the sum of the squares of the...four sides is equivalent to the sum of the squares of the two diagonals, plus four times the square of the line joining the middle points of the diagonals....
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Elements of Geometry and Trigonometry from the Works of A.M. Legendre ...

Charles Davies - Geometry - 1854 - 436 pages
...AB°•=oAE*+EB*+1EBxED (p. 13). Hence, by adding and observing that EB and EC are equal, we have ED C Cor. 1. In any quadrilateral, the sum of the squares of the...four sides is equivalent to the sum of the squares of the two diagonals, plus four times the square of tlte line joining tl1e middle points of the diagonals....
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Orr's Circle of the Sciences: Organic nature, vols. 1-3 (1854-1856)

William Somerville Orr - Science - 1854 - 534 pages
...the circumference to the four corners of the parallelogram, will always amount to the same sum. 7. In any quadrilateral the sum of the squares of the four sides is equal to the sum of the squares of the diagonals, together with four times the square of the linn joining...
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Elements of Geometry and Trigonometry from the Works of A. M. Legendre ...

Adrien Marie Legendre, Charles Davies - Geometry - 1857 - 442 pages
...12). And, B~ Fl1 C (P. 13). Hence, by adding and observing that EB and EC are equal, we have (lor. 1. In any quadrilateral, the sum of the squares of the...four sides is equivalent to the sum of the squares of the two diagonals, plus four times the square of tf1e line join1ng the middle points of the diagonals,...
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Elements of Plane and Spherical Trigonometry: With Practical Applications

Benjamin Greenleaf - Geometry - 1862 - 532 pages
...E С XED, we have ABS + ACa = 2 1~E8 + 2 E~B2PROPOSITION XV. — THEOREM. 248. In any parallelogram the sum of the squares of the four sides is equivalent to the sum of the squares of the two diagonals. Let А В С D be any parallelogram, the diagonals of which are AC, BD ; then the...
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Elements of Geometry and Trigonometry: With Practical Applications

Benjamin Greenleaf - Geometry - 1862 - 518 pages
...EBXED to ECXED, we have AB2 + AC2 = 2 AE2 + 2 EBaPROPOSITION XV. — THEOREM. 248. In any parallelogram the sum of the squares of the four sides is equivalent to the sum of the squares of the two diagonals. Let ABCD be any parallelogram, the diagonals of which are AC, BD ; then the sum...
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Elements of Geometry: With Practical Applications to Mensuration

Benjamin Greenleaf - Geometry - 1863 - 504 pages
...to ECXED, we have AB2 + AC2 = 2 AE2 + 2 EB2. PROPOSITION XV. — THEOREM. 248. In any parallelogram the sum of the squares of the four sides is equivalent to the sum of the squares of the two diagonals. Let ABCD be any parallelogram, DC the diagonals of which are AC, BD ; then the sum...
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Elements of Geometry: With Practical Applications to Mensuration

Benjamin Greenleaf - Geometry - 1868 - 340 pages
...EBXEDtoECXED, we have AB2 + AC2 = 2 AE2 + 2 E~B2. PROPOSITION XV. — THEOREM. 248. In any parallelogram the sum of the squares of the four sides is equivalent to the sum of the squares of the two diagonals. Let ABCD be any parallelogram, the diagonals of which are AC, BD ; then the sum...
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Elements of Geometry and Trigonometry: With Practical Applications

Benjamin Greenleaf - 1869 - 516 pages
...PROPOSITION XVI. — THEOREM. 249. In any quadrilateral the sum of the squares of the sides is equivalent to the sum of the squares of the diagonals, plus four times the square of the straight line that joins the middle points of the diagonals. Let ABCD be any quadrilateral, the diagonals...
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