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" If, at a point in a straight line, two other straight lines, upon the opposite sides of it, make the adjacent angles together equal to two right angles, these two straight lines shall be in one and the same straight line. "
The Elements of Geometry, Symbolically Arranged - Side 21
av Great Britain. Admiralty - 1846
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Geometry Without Axioms; Or the First Book of Euclid's Elements. With ...

Thomas Perronet Thompson - 1833 - 150 sider
...to two right angles, and those on both sides will be equal to four. PROPOSITION XIII. THEOBEM. — If, at a point in a straight line, two other straight lines, on the opposite sides of it, make the adjacent angles together equal to two right angles; those two...
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The Elements of Euclid; viz. the first six books, together with the eleventh ...

Euclides - 1834
...one straight line, &c. QED ' PROPOSITION XIV. THBOR. — If, at a point in a straight line, two oiher straight lines, upon the opposite sides of it, make...adjacent angles together equal to two right angles, these Iwo straight lines shall be in one and the same straight line. At the point B, in the straight line...
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The Elements of Euclid: Viz. the First Six Books, Together with the Eleventh ...

Euclid - 1835 - 513 sider
...are together equal to two right angles. Wherefore, " when a straight line," &c. QED PROP. XIV. THEOR. If, at a point in a straight line, two other straight...one and the same straight line. At the point B in the straight line AB, let the two straight lines BC, BD upon the opposite sides of AB, make the adjacent...
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The Elements of Euclid: viz. the first six books, together with the eleventh ...

Robert Simson - 1835 - 513 sider
...Wherefore, " when a straight line," &c. QED PROP. XIV. THEOR. If , at a point in a straight line, tu.o other straight lines upon the opposite sides of it,...one and the same straight line. At the point B in the straight line AB, let the two straight lines BC, BD upon the opposite sides of AB, make the adjacent...
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Library of Useful Knowledge: Geometry, plane, solid, and spherical [by ...

1835
...Straight lines which pass through the same two points lie in the same straight line . . . ax. 4 (J>) If at a point in a straight line two other straight lines upon opposite sides of it make the adjacent angles together equal to two right angles, these two straight...
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The Teacher's Assistant in the "Course of Mathematics Adapted to the Method ...

1836 - 472 sider
...another upon one side of it, are either two right angles, or are together equal to two right angles. XIV. If, at a point in a straight line, two other straight lines, upon the op. posite sides of it, make the adjacent angles together equal to two right angles, these two straight...
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The Element of Geometry

John Playfair - 1836 - 114 sider
...makes with another on the same side of it, are together equal to two right angles. PROP. II. THEOR. If, at a point in a straight line, two other straight lines on the opposite sides of it make the adjacent angles together equal to two right angles, these two...
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Elements of Geometry: Containing the First Six Books of Euclid : with a ...

John Playfair - 1837 - 318 sider
...angles ; because their sum is equal to that of the two adjacent angles DBA, ABC. PROP. XIV. THEOR. If, at a point in a straight line, two other straight...equal to two right angles, these two straight lines are in one and the same straight line. At the point B in the straight line AB, let the two straight...
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Elements of Plane Geometry According to Euclid

Andrew Bell - 1837 - 240 sider
...angles, are equal to one another ; that is, x = m-\-nx = two right angles. PROPOSITION XIY. THEOREM. If, at a point in a straight line, two other straight...equal to two right angles, these two straight lines shiill be in one and the same straight line. At the point B in the straight line AB, let the two straight...
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The First Six and the Eleventh and Twelfth Books of Euclid's Elements: With ...

Euclid, James Thomson - 1837 - 390 sider
...any number of lines meeting in one point, are together equal to four right angles. PROP. XIV. THEOR. IF, at a point in a straight line, two other straight lines on the opposite sides of it, make the adjacent angles together equal to two right angles, these two...
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