 | Tandalam Sundara Rao - Geometry - 1893 - 134 pages
...interior angles of a triangle are together equal to two right angles. 23. The property C that the three interior angles of a triangle are together equal to two right angles is illustrated as follows by paper folding. Fold CD perpendicular to AB. Bisect AD, BD in E and F respectively.... | |
 | Great Britain. Education Department. Department of Science and Art - 1894 - 894 pages
...the other sides, and the angle at the base opposite to the greater side. (10.) 9. Show that the three interior angles of a triangle are together equal to two right angles. Let ABODE be a five sided figure with no pair of its sides parallel ; produce all the sides both ways... | |
 | Euclid, Henry Sinclair Hall, Frederick Haller Stevens - Euclid's Elements - 1900 - 330 pages
...then the exterior angle sMll be equal to the sum of the two interior opposite angles; also the three interior angles of a triangle are together equal to two right angles. B CD Let ABC be a triangle, and let one of its sides BC be produced to D. Then (i) the exterior angle... | |
 | Euclid - Geometry - 1901 - 672 pages
...angles A В С and С A BQED Endemus affirms that the latter portion of this theorem, viz., the three interior angles of a triangle are together equal to two right angles, was first found out by Pithagoras, who demonstrated it as follows : Let A В С be a triangle. Through... | |
 | Tandalam Sundara Rao - Geometry - 1901 - 176 pages
...BA on to AD. The engine has successively described the angles ACB, CBA, and BAG. Therefore the three interior angles of a triangle are together equal to two right angles. 167. The property that the three interior angles of a triangle are together equal to two right angles... | |
 | Euclid - Euclid's Elements - 1904 - 488 pages
...then the exterior angle shall be equal to the sum of the two interior opposite angles; also the three interior angles of a triangle are together equal to two right angles. A Let ABC be a triangle, and let one of its sides BC be produced to D. Then (i) the exterior angle... | |
 | Harold Henry Joachim - Knowledge, Theory of - 1906 - 192 pages
...diagonal is incommensurate with the side of the square ' were a truth as final and significant as eg 'the interior angles of a triangle are together equal to two right angles ' ; and as if the real counterparts of the two judgements were each, equally and alike, a coherent... | |
 | University of Calcutta - 1907 - 446 pages
...exterior 4 angle is eqnnl to the earn of the two interior and opposite angles ; also that the three interior angles of a triangle are together equal to two right angles. If ABC is a triangle having a right angle at A, show that the straight 2 line joining A to the middle... | |
 | Queen's University (Kingston, Ont.) - 1915 - 764 pages
...in one side of a triangle, draw a straight line that bisects the area of the triangle. (c) The three interior angles of a triangle are together equal to two right angles. FACULTY OF EDUCATION. METHODS IN CLASSICS. (Specialist). 1. Quis Parthum paveat, quis gelidum Scythen,... | |
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... the three interior angles of a triangle are together equal to two right angles. 
