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 Books Bücher 1 - 10 von 16 in 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.
Iron: An Illustrated Weekly Journal for Iron and Steel Manufacturers ... - Seite 331
herausgegeben von - 1824
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## Mechanics Magazine, Band 2

1824
...divide the parallelogram into two pairs of identical triangles ; viz., CED identical to A £ B, and AEC indentical to EBD, the truths of which will be evident...on each other. Corollary 2. Hence also if one angle of1 a parallelogram is ft right angle, all the other angles will also be right angles, and in that...
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## Mechanics' Magazine and Journal of Science, Arts, and Manufactures, Band 2

1824
...divide the parallelogram into two pair* of identical triangles ; viz., CED identical to AEB, and AEC indentical to EBD, 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...
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## Mathematical Dictionary and Cyclopedia of Mathematical Science: Comprising ...

Charles Davies, William Guy Peck - 1855 - 592 Seiten
...and two. The opposite eidce are equal to each other, taken in pain, as are also the opposite angles. If one angle of a parallelogram is a right angle, all the other angles are also right angles, and the parallelogram is a rectangle. If two adjacent sides of a parallelogram...
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## Elements of Geometry

Simon Newcomb - 1881 - 399 Seiten
...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...
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## Essentials of Geometry

Alfred Hix Welsh - 1883 - 267 Seiten
...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 - 1887 - 322 Seiten
...* 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 - 1899 - 240 Seiten
...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....
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## Elementary Geometry, Plane and Solid: For Use in High Schools and Academies

Thomas Franklin Holgate - 1901 - 440 Seiten
...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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## Plane Geometry

Edward Brooks - 1901 - 266 Seiten
...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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