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That, if a straight line falling on two straight lines make the interior angles on the same side less than two right angles, the two straight lines, if produced indefinitely, meet on that side on which are the angles less than the two right angles.
Elements of Geometry and Trigonometry - Page 38
by Adrien Marie Legendre - 1852 - 432 pages

## Elements Of Geometry And Trigonometry

Charles Davies - 1874 - 464 pages
...angles. PROPOSITION XXI. THEOREM. If two straight lines intersect a third straight line, making the sum of the interior angles on the same side less than two right anqlcs, the two lines will meet if sufficiently produced. Let the two lines CD, IL, meet the line EF,...

## Elements of Geometry with Exercises for Students: An an Introduction to ...

Aaron Schuyler - Geometry - 1876 - 384 pages
...three sides in their plane, at their middle point*. Any two of these perpendiculars, as DL, EM, will meet if sufficiently produced ; for, if they do not meet, they are parallel (40). Then, AB, which by hypothesis is perpendicular to DL, is also perpendicular to KM parallel to...

## Geometry for schools, comprising books i. and ii. of Euclid, with some ...

Euclides - 1883 - 176 pages
...contained by the other two. COR. — If a straight line meeting two other straight lines make the two interior angles on the same side less than two right angles, the two straight lines, if produced, will meet on that side on which are the angles less than two right angles....

## Stewart's specific subjects. Euclid. [1st] (-3rd stage). [With 2 issues of ...

Stewart W. and co - 1884 - 272 pages
...two right angles; but those straight lines which, with another straight line falling upon them, make the interior angles on the same side less than two right angles, do meet together if continually "oduced ; therefore the straight lines AB, CD, if oduced far enough,...

## Elements of Geometry and Trigonometry from the Works of A.M. Legendre ...

Charles Davies, Adrien Marie Legendre - Geometry - 1885 - 538 pages
...angles. PROPOSITION XXI. THEOREM. // two straight lines intersect a third straight line, making the sum of the interior angles on the same side less than...than two right angles: then will IL and CD meet if suff1ciently produced. For, if they do not meet, they must be parallel (D. 16). But, if they were parallel,...

## Elements of Plane Geometry

Alan Sanders - Geometry, Modern - 1901 - 260 pages
...parallels, is also bisected. PROPOSITION XX. THEOREM 127. If two lines are cut by a transversal, making the sum of the interior angles on the same side less than two right angles, the lines will meet if sufficiently produced. Let AB and CD be cut by EF, making Z 1 + Z 2 < 2 KA's. To...

## Elements of Plane and Solid Geometry

Alan Sanders - Geometry - 1903 - 392 pages
...parallels, is also bisected. PROPOSITION XX. THEOREM 127. If two lines are cut by a transversal, making the sum of the. interior angles on the same side less than two right angles, the lines will meet if sufficiently produced. f Let AB and CD be cut by EF, making Z 1 + Z 2 < 2 RA's....

## The Monist, Volume 13

Philosophy - 1903 - 750 pages
...parallels, viz. , that — "those straight lines which, with another straight line falling upon them, make the interior angles on the same side less than two right angles, do meet if continually produced." This is exactly the point to be proved, for it is only one form of...