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 Bøker Bok 31–40 av 185 på After remarking that the mathematician positively knows that the sum of the three... After remarking that the mathematician positively knows that the sum of the three angles of a triangle is equal to two right angles... Elements of Geometry and Trigonometry - Side 65
av C. Davies - 1867
Uten tilgangsbegrensning - Om denne boken ## The American Journal of Education, Volum 23

Henry Barnard - 1872
...catch either into other cogged wheels, or into pinions, or into trundles, Ac. Of the Triangk. — The sum of the three angles of a triangle is equal to two right-angles, Ac. Of similar Triangles. — Two triangles are similar when the angles of one are equal...
Uten tilgangsbegrensning - Om denne boken ## The American Journal of Education, Volum 23

Henry Barnard - 1872
...catch either into other cogged wheels, or into pinions, or into trundles, Ac. Of the Triangle. — The sum of the three angles of a triangle is equal to two right-angles, Ac. Of eimiiar Triangle*. — Two triangles are similar when the ingles of one ar» equal...
Uten tilgangsbegrensning - Om denne boken ## a manual of discipline and instruction for the use of the teachers of the ...

1873
...side in -each respectively equal ; (c) when they have three sides in each respectively equal. 6. The sum of the three angles of a triangle is equal to two right angles. I7. The sum of the interior angles of a polygon is equal to twice as many right angles as the...
Uten tilgangsbegrensning - Om denne boken ## The National Teacher: A Monthly Educational Journal, Volum 4

1874
...heartfelt pleasure and profound satisfaction from the contemplation of that wonderful truth, that the sum of the three angles of a triangle is equal to two right angles. My friend, who sits before me, used to take particular delight in putting this at me, when...
Uten tilgangsbegrensning - Om denne boken ## The Ohio Educational Monthly: A Journal of School and Home Education, Volum 23

1874
...heartfelt pleasure and profound satisfaction from the contemplation of that wonderful truth, that the sum of the three angles of a triangle is equal to two right angles. My friend, who sits before me, used to take particular delight in putting this at me, when...
Uten tilgangsbegrensning - Om denne boken ## How to Teach: A Manual of Methods for a Graded Course of Instruction... for ...

Henry Kiddle, Thomas F. Harrison, Norman Allison Calkins - 1875 - 269 sider
...equality as a definite fact, and inequality indefinitely. Thus, it is required to be proved that the sum of the three angles of a triangle is equal to two right angles ; also, that, of any two sides of a triangle, that which lies opposite to the greater angle...
Uten tilgangsbegrensning - Om denne boken ## Elements of Geometry with Exercises for Students: An an Introduction to ...

Aaron Schuyler - 1876 - 372 sider
...equal. 76. Exercises. 1. Prove by means of the annexed diagram, in which DE is parallel to AC, that the sum of the three angles of a triangle is equal to two right angles. 2. The sum of the three straight lines drawn from any point within a triangle to the vertices...
Uten tilgangsbegrensning - Om denne boken ## Elements of Plane and Solid Geometry

George Albert Wentworth - 1877 - 398 sider
...a point to a straight line make equal acute angles with that line. PROPOSITION XXL THEOREM. 98. The sum of the three angles of a triangle is equal to two right angles. BE C Let ABC be a triangle. We are to prove ZB + ZB CA + ZA = two rt. A Draw CE II to AB, and...
Uten tilgangsbegrensning - Om denne boken ## Hermathena, Volum 3

1877
...drawn from the preceding notices. First inference. — Thales must have known the theorem that the sum of the three angles of a triangle is equal to two right angles. Pamphila, in [<f], refers to the discovery of the property of a circle that all triangles described...
Uten tilgangsbegrensning - Om denne boken ## Elements of Plane and Solid Geometry

George Albert Wentworth - 1877 - 398 sider
...point to a straight line make equal acute angles with that line. PROPOSITION XXI. THEOREM. 98. The sum of the three angles of a triangle is equal to two righd angles. BE C Let ABC be a triangle. We are to prove Z. B + Z. BCA + Z. A = two rt. A. Draw CE...
Uten tilgangsbegrensning - Om denne boken