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Books Books 11 - 15 of 15 on If one angle of a parallelogram is a right angle, all the other angles are right....  
" If one angle of a parallelogram is a right angle, all the other angles are right angles, and the figure is a rectangle. "
Mathematical Dictionary and Cyclopedia of Mathematical Science: Comprising ... - Page 419
by Charles Davies - 1872 - 592 pages
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Plane Geometry

John Wesley Young, Albert John Schwartz - Geometry, Plane - 1915 - 223 pages
...two adjacent sides of a parallelogram are equal, all the sides are equal. 232 237. COROLLARY 7. If one angle of a parallelogram is a right angle, all the angles are right angles. 235 Dt \G BA ~ B FIG. 104. FIG. 105. 238. A rectangle. If one angle...
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Junior High School Mathematics: First [-third] Course, Book 3

William Ledley Vosburgh, William Frederick Gentleman - Mathematics - 1919
...of a parallelogram is equal to 180 (Fig. 125). Fio. 125. (SUGGESTION. Z1=ZCr. Why?) 4. Prove that if one angle of a parallelogram is a right angle all the angles are right angles. 123. THEOREM V. The diagonals of a parallelogram bisect each other. DC...
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Solid Geometry

Charles Austin Hobbs - Geometry, Solid - 1921 - 192 pages
...parallel lines are equal. Prop. 54. The opposite angles of a parallelogram are equal. Prop. 54, Cor. // one angle of a parallelogram is a right angle, all the other angles are right angles, and the figure is a rectangle. Prop. 55. The diagonals of a parallelogram bisect each...
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The Manufacture of Pulp and Paper: A Textbook of Modern Pulp and ..., Volume 1

Joint Textbook Committee of the Paper Industry, J. Newell Stephenson - Papermaking - 1921
...equals \i X BE X CD, and since CAB = CDB, the area of the parallelogram is 2 X 1$ CD X BE = CD X BE. 76. If one angle of a parallelogram is a right angle, all the angles are right angles, in accordance with Art. 74, and the parallelogram is then called a rectangle;...
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Appleton's New Practical Cyclopedia: A New Work of Reference Based ..., Volume 5

Marcus Benjamin, Arthur Elmore Bostwick, Gerald Van Casteel, George Jotham Hagar - Encyclopedias - 1910
...measure of parallax. Parallel'ogram, quadrilateral whose opposite sides, taken two and two, are parallel. If one angle of a parallelogram is a right angle, all the other angles are right angles, and the figure is a rectangle. If two adjacent sides are equal, the other sides are also...
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