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The three angles of any triangle are equal to two right angles — the pupil need never measure one real triangle to know this.
Circular of Information - Página 129
por United States. Bureau of Education, United States. Office of Education - 1889
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## Geodæsia: Or, The Art of Surveying and Measuring Land Made Easie

John Love - 1720 - 196 páginas
...great as 90 Degrees ; or which confifts of two Acute Angles and one Obtufe •viz. at that D. 3. All the three Angles of any Triangle are equal to two Right Angles, or 1 80 Degrees \$ k> that one Angle being known, the other two together are known a lib; or two being...
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## Natural obligations to believe the principles of religion, and divine ...

...Mathematicks, upon viewing a great variety of Triangles and other figures, fhould take a fancy to deny that the three angles of any triangle are equal to two right angles, or to the three angles of any other triangle}beca.ufe he will not give himfelf the trouble of confidering...
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## Geodæsia: Or, The Art of Surveying and Measuring of Land Made Easy ...

John Love - 1744 - 207 páginas
...great as 90 Degrees; or which confifts of two Af cute Angles and one Obtufe, viz. as that D» , 5. All the three Angles of any Triangle are equal to two Right Angles, or .., 1 80 Degrees ; fci that One Angle being known, tne other two together are known alfo ; or two.be1hg...
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## Euclid's Elements of Geometry: From the Latin Translation of Commandine. To ...

John Keill - 1772 - 399 páginas
...I fay, two oppofite Angles thereof are equal to two Right Angles. For join AD, BC. \ Then, becaufe the three Angles of any Triangle are * equal to two Right Angles, the three Angles of the* 3Z- Tt Triangle ABC, viz. the Angles CAB, ABC, BCA, are equal to two Right Angles....
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## Euclid's Elements of Geometry: From the Latin Translation of Commandine, to ...

John Keill - 1782 - 399 páginas
...D. I fay, two oppofite Angles thereof are equal to two Right Angles. F»rjoin AD, B C. Then, becaufe the three Angles of any Triangle are * equal to two Right Angles, the three Angles of the * aZl '• Triangle ABC, viz. the Angles CAB, ABC, BC A, are equal to-two Right...
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## Geodaesia: Or, The Art of Surveying and Measuring Land Made Easy. Shewing by ...

John Love - 1792 - 206 páginas
...90 degrees ; or as C, which con'f1fts of two acute angles and one obt1ife, viz, that at "d.> 3. All the three angles of any triangle are equal to two 'right angles, or 180 degrees; fo that one angle being known, the fiirri of the other two becomes known alfo ., or...
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## Easy Introduction to Mathematics, Volumen2

Charles Butler - 1814
...rad.— log. AB ; whence the angle B is found, both by natural numbers and logarithms. Lastly, since the three angles of any triangle are equal to two right angles (32. 1.) =180", and the angle C (a right angle) = 90", v B+A= (180>-C=lS<r— 90°=) 90°; but the...
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## Elements of Geometry: Containing the First Six Books of Euclid: With a ...

John Playfair - 1819 - 317 páginas
...each to each, the third angles are also equal. Now, this being demonstrated, it is easy to prove that the three angles of any triangle are equal to two right angles. Let ABC be a triangle right angled at A, draw AD perpendicular to BC. The triangles ABD, ABC have the...
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## Elements of Geometry: With Notes

John Radford Young - 1827 - 208 páginas
...Therefore the three angles of a triangle cannot be greater than two right angles. PROPOSITION III. The three angles of any triangle are equal to two right angles. If what is affirmed be not true, let the three angles of the triangle ACB be less than two right angles,...
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## Elements of Geometry: Containing the First Six Books of Euclid : with a ...

John Playfair - 1837 - 318 páginas
...each to each, the third angles are also equal. Now, this being demonstrated, it is easy to prove that the three angles of any triangle are equal to two right angles. Let ABC be a triangle right angled at A, draw AD perpendicular to BC. The triangles ABD, ABC have the...
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