 | John Radford Young - 1827 - 228 pàgines
...diagonals of a rhomboid, therefore, bisect each other. PROPOSITION xxxi. THEOREM. (Converse of Prop. XXX.) If the diagonals of a quadrilateral bisect each other, the figure is a rhomboid. If the diagonals AC, BD (preceding diagram), bisect each other, ABCD is a rhomboid. For the... | |
 | Elias Loomis - 1860 - 246 pàgines
...will be a rectangle. Prop- 9. The parallelogram whose diagonals are equal is rectangular. Prop. 8. If the diagonals of a quadrilateral bisect each other, the figure is a parallelogram. Prop. 10. Any line drawn through the centre of the diagonal of a parallelogram to meet the sides, is... | |
 | Benjamin Greenleaf - 1861 - 638 pàgines
...Therefore the diagonals of a rhombus bisect each other at right angles. PROPOSITION XXXV. — THEOREM. 115. If the diagonals of a quadrilateral bisect each other, the figure is a parallelogram. Let ABCD be a quadrilateral, and D AC, DB its diagonals intersecting at E ; then will the figure be... | |
 | Benjamin Greenleaf - 1862 - 518 pàgines
...Therefore the diagonals of a rhombus bisect each other at right angles. PROPOSITION XXXV. — THEOREM. 115. If the diagonals of a quadrilateral bisect each other, the figure is a parallelogram. Let ABCD be a quadrilateral, and DC AC, DB its diagonals intersecting at E ; then will the figure be... | |
 | Benjamin Greenleaf - 1863 - 504 pàgines
...Therefore the diagonals of a rhombus bisect each other at right angles. PROPOSITION XXXV. — THEOREM. 115. If the diagonals of a quadrilateral bisect each other, the figure is a parallelogram. Let ABCD be a quadrilateral, and DC AC, DB its diagonals intersecting at E ; then will the figure be... | |
 | Eli Todd Tappan - 1864 - 288 pàgines
...equal. Therefore, the triangles are equal (285), and AH is equal to CH, and BH to DH. 363. Theorem — If the diagonals of a quadrilateral bisect each other, the figure is a parallelogram. To he demonstrated by the student. RECTANGLE 363. If one angle of a parallelogram is right, the others... | |
 | Benjamin Greenleaf - 1868 - 340 pàgines
...Therefore the diagonals of a rhombus bisect each other at right angles. PROPOSITION XXXV. — THEOREM. 115. If the diagonals of a quadrilateral bisect each other, the figure is a parallelogram. Let ABCD be a quadrilateral, and AC, DB its diagonals intersecting at E ; then will the figure be a... | |
 | William Chauvenet - 1871 - 380 pàgines
...vertex to the middle of the base bisects the vertical angle (87). PROPOSITION XXXIV.— THEOREM. 112. If the diagonals of a quadrilateral bisect each other, the figure is a, parallelogram. Let the diagonals of the quadrilateral ABCD bisect each other in E. Then, the triangles AED and CEB... | |
 | William Frothingham Bradbury - 1872 - 262 pàgines
...necessarily a parallelogram ? 85. The diagonals of a parallelogram bisect each other. 86. (Converse of 85.) If the diagonals of a quadrilateral bisect each other, the figure is a parallelogram. 87. The diagonals of a rhombus bisect each other at right angles. 88i (Converse of 87.) If the diagonals... | |
 | Eli Todd Tappan - 1873 - 288 pàgines
...equal. Therefore, the triangles are equal (285), and AH is equal to CH, and BH to DH. 362. Theorem — If the diagonals of a quadrilateral bisect each other, the figure is a parallelogram. To be demonstrated by the student. RECTANGLE 363. If one angle of a parallelogram is right, the others... | |
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If the diagonals of a quadrilateral bisect each other, the figure is a parallelogram. 
