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And because the angle ABC is equal to the angle BCD, and the angle CBD to the angle ACB...
The Elements of Euclid: Viz. the First Six Books, Together with the Eleventh ... - Page 30
by Euclid - 1835 - 513 pages

## Elements of Geometry: Containing the First Six Books of Euclid, with a ...

John Playfair - Euclid's Elements - 1836 - 488 pages
...ABD is equal to the whole angle ACD : And the angle BAC has been shewn to be equal to the angle BDC ; therefore the opposite sides and angles of a parallelogram...its diameter bisects it ; for AB being equal to CD, arid BC common, the two AB, BC are equal to the two DC, CB, each to each ; now tfee angle ABC is equal...

## The Teacher's Assistant in the "Course of Mathematics Adapted to the Method ...

Mathematics - 1836 - 472 pages
...and parallel straight lines, towards the same parts, are also themselves equal and parallel. XXXIV. The opposite sides and angles of a parallelogram are equal to one another, and the diameter bisects it, that is, divides it into two equal parts. XXXV. Parallelograms upon the...

## Elements of Geometry: Containing the First Six Books of Euclid : with a ...

John Playfair - Geometry - 1837 - 332 pages
...ABD is equal to the whole angle ACD : And the angle BAG has been shewn to be equal to the angle BDC : therefore the opposite sides and angles of a parallelogram...and BC common, the two AB, BC are equal to the two IDC, CB, each to each ; now the angle ABC is equal to the angle BCD ; therefore the triangle ABC is...

## The First Six and the Eleventh and Twelfth Books of Euclid's Elements: With ...

Euclid - Geometry - 1837 - 410 pages
...quadrilateral which has two sides equal and parallel, is (I. def. 24.) a parallelogram. PROP. XXXIV. THEOR. THE opposite sides and angles of a parallelogram are equal to one another ; and (2.) the diagonal bisects it. Let ADf be a parallelogram, of which BC is a diagonal; (1.) the...

## Euclid's Elements [book 1-6] with corrections, by J.R. Young

Euclides - 1838 - 264 pages
...to BD : and it was shown to be equal to it. Therefore, straight lines, &c. QED PROP. XXXIV. THEOR. The opposite sides and angles of a parallelogram are equal to one another, and the diameter bisects it, that is, divides it into two equal parts. N. B — A parallelogram is...

## The Elements of Euclid; viz. the first six books,together with the eleventh ...

Euclides - 1841 - 378 pages
...opposite sides and angles of parallelograms are equal to one another; also, their diameter bisects them; for AB being equal to CD, and BC common, the two AB, Because AB is parallel to CD, AB BC are equal to the two DC, CB, each to each; and the angle ABC has...

## Elements of Geometry: Containing the First Six Books of Euclid, with a ...

John Playfair - Euclid's Elements - 1842 - 332 pages
...to two right angles ; therefore, the opposite sides must be equal and parallel. PROP. XXXIV. THEOR. The opposite sides and angles of a parallelogram are equal to one another, and the diagonal bisects it ; that is, divid'es it into two equal parts. NB A Parallelogram is a four-sided...

## Elements of geometry: consisting of the first four,and the sixth, books of ...

Euclides - 1842 - 320 pages
...to BD ; and it was shown to be equal to it. Therefore, straight lines, &c. QED PROP. XXXIV. THEOR. THE opposite sides and angles of a parallelogram are equal to one another, and the diameter, or diagonal, bisects the figure. NB A parallelogram is a four-sided figure, of which...