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Books Books 1 - 10 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
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Mechanics' Magazine and Journal of Science, Arts, and Manufactures, Volume 2

Iron industry and trade - 1824
...the truths of which will be evident by laying the triangles on each other. Corottary 2. Hence also if one angle of a parallelogram is a right angle, all the other angles will also be right angles, and in that case, the diagonals will be equal in length to each other. Note....
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Iron: An Illustrated Weekly Journal for Iron and Steel ..., Volume 2

Sholto Percy - Industrial arts - 1824
...the truths of which will be evident by laying the triangles on each other. Corollary 2. Hence also if one angle of a parallelogram is a right angle, all the other angles will also be right angles, and in that case, the diagonals will be equal in length to each other. Note....
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Elements of Geometry

Simon Newcomb - Geometry - 1881 - 399 pages
...remaining angles of the one will be equal to the corresponding angles of the other. 125. Corollary 3. If one angle of a parallelogram is a right angle, all the other angles are right angles. THEOREM XXVIII. 126. A pair of parallel straight lines intercept equal lengths of parallel...
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Essentials of Geometry

Alfred Hix Welsh - Geometry - 1883 - 267 pages
...equal. 2. Prove (Th. XII) that the sum of the angles of a quadrilateral equals four right angles. 3. If one angle of a parallelogram is a right angle, all the others are right angles. THEOREM XXIV. If the opposite sides of a quadrilateral are equal, the figure...
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Chauvenet's Treatise on Elementary Geometry

William Chauvenet - Geometry - 1887 - 322 pages
...* o XXV. Hence the triangles ABC and ADC are equal, by Proposition VII. EXERCISES. 1. Theorem. If one angle of a parallelogram is a right angle. all the angles are right angles, and the figure is a rectangle. 2. Theorem. If two angles have the sides...
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CHAUVENETS TREATISE ON ELEMENTARY GEOMETRY

W. E. BYERLY - 1887
...Proposition XXV. Hence the triangles ABC and AD C are equal, by Proposition VII. EXERCISES. 1. Theorem. If one angle of a parallelogram is a right angle, all the angles are right angles, and the figure is a rectangle. 2. Theorem. If two angles have the sides...
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The Elements of Plane Geometry

Charles Austin Hobbs - Geometry, Plane - 1899 - 240 pages
...is perpendicular to the bisector of the exterior angle at the vertex C. Proposition 61. Theorem. 73. If one angle of a parallelogram is a right angle, all the other angles are right angles, and the figure is a rectangle. Proposition 62. Theorem. Proposition 63. Theorem. 75....
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Plane Geometry

Edward Brooks - 1901
...sides of the figure are parallel ; therefore the figure is a parallelogram. Therefore, etc. COR. If one angle of a parallelogram is a right angle, all the angles are right angles and the figure is a rectangle. Let the pupil prove it. PROPOSITION XXXI. ...
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Elementary Geometry, Plane and Solid: For Use in High Schools and Academies

Thomas Franklin Holgate - Geometry - 1901 - 440 pages
...5. If both pairs of opposite angles of a quadrilateral are equal, the figure is a parallelogram. 6. If one angle of a parallelogram is a right angle, all the angles are right angles. 7. If two sides of a quadrilateral are parallel, and the other two equal but...
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Appleton's new practical cyclopedia: a new work of reference based upon the ...

Marcus Benjamin, Arthur Elmore Bostwick, Gerald Van Casteel, George Jotham Hagar - Reference - 1910
...measure of parallax. Parallelogram, 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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