Libros Libros 71 - 80 de 120 sobre When you have proved that the three angles of every triangle are equal to two right...
When you have proved that the three angles of every triangle are equal to two right angles...
Spirit and mind polarity, or The disentanglement of ideas - Página 2
por Arthur Young - 1873
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## The popular educator, Volumen1

Popular educator - 1860
...required. The reason of this construction is plain, „ from Prop. XXXII., Book I., Euclid, which asserts that the three angles of every triangle are equal to two right anglet; and from Prop. XIII., Book I., which asserts that the anglei "/in-/, one straight line ma/tes...
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## Euclid's Elements of Geometry: Chiefly from the Text of Dr. Simson, with ...

Robert Potts - 1860 - 361 páginas
...any two of its opposite angles shall together be equal to two right angles. Join AC, BD. And because the three angles of every triangle are equal to two right angles, (I. 32.) the three angles of the triangle CAB, viz. the angles CAB, ABC, BCA, are equal to two right...
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## Popular and mathematical astronomy, with the principal formulæ of plane and ...

...already proved may be obtained, which shows them to be true for any triangle. • We know (by Eu. 1, 32), that the three angles of every triangle are equal to two right angles ; therefore those of ABC are equal to two right angles ; and since B = 90°, therefore A + C = 90°,...
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## The school Euclid: comprising the first four books, by A.K. Isbister

Euclides - 1862
...together equal to two right angles. CONSTRUCTION Draw the diagonals AC and DB. DEMONSTRATION Because the three angles of every triangle are equal to two right angles, (i. 32) the three angles of the triangle CAB, viz. the angles CAB, ABC, BCA, are equal to two right...
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## The school edition. Euclid's Elements of geometry, the first six books, by R ...

Robert Potts - 1864
...two of its opposite angles shall together be equal to two right angles. c Join AC, BD. And because the three angles of every triangle are equal to two right angles, (I. 32.) the three angles of the triangle CAB, viz. the angles CAB, ABC, BCA, are equal to two right...
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## The college Euclid: comprising the first six and the parts of the eleventh ...

...together equal to two right angles. CONSTRUCTION Draw the diagonals AC and I)B. DEMONSTRATION Because the three angles of every triangle are equal to two right angles, (I. 32) the three angles of the triangle CAB, viz. the angles CAB, ABC, BCA, are equal to two right...
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## Treatise on Mathematical Instruments: Their Construction, Adjustment ...

John Fry Heather - 1866 - 185 páginas
...to the two angles HI A and '•* HA i ; and because the vertical angles AVH and IVE are equal, and that the three angles of every triangle are equal to two right angles, therefore the two angles VIE and s EH are, together, equal to the two angles AH v and HA i, and therefore...
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## Euclid's Elements of Geometry: Chiefly from the Text of Dr. Simson, with ...

Robert Potts - 1868 - 410 páginas
...two of its opposite angles shall together be equal to two right anglss. .0 Jam AC, BD. And because the three angles of every triangle are equal to two right angles, (I. 32.) the three angles of the triangle CAB, viz. the angles CAB, ABC, BCA, are equal to two right...
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## Mathematical Instruments: Optical instruments

John Fry Heather - 1871
...to the two interior angles ni A and HAI; and because the vertical angles AVH and iv E are equal, and that the three angles of every triangle are equal to two right angles, therefore the two angles TIE and s EH are, together, equal to the two angles AH v and HAI, and therefore...
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## The essentials of geometry, plane and solid, as taught in French and German ...

John Reynell Morell - 1871 - 131 páginas
...quadrilateral is divided into two triangles, whose angles form those of the quadrilateral ; and as the three angles of every triangle are equal to two right angles or 180°, the angles of the quadrilateral must be equal to four right angles or 300°. From this it follows...
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