 | John Playfair - Geometry - 1829 - 210 pages
...angles is equal to the other inferior and opposite angle. 2. The three angles of every rectilineal triangle are together equal to two right angles. Let ABC be a triangle; the three angles A, B, C, are together equal to two right angles. Produce any side BC to D, then the... | |
 | Thomas Perronet Thompson - Euclid's Elements - 1833 - 168 pages
...any triangle be prolonged, the exterior angle is equal to the sum of the two interior and opposite angles. Let ABC be a triangle, and let one of its sides, as BC, be produced to D. The exterior angle ACD shall be equal to the two interior and opposite angles... | |
 | Euclides - 1834 - 518 pages
...from the vertex to the point of section, divides the outward angle of the triangle into tlvo equal angles. Let ABC be a triangle, and let one of its sides BA be produced to E ; and let the outward angle CAE be divided into two equal angles by the straight... | |
 | Euclid - 1835 - 540 pages
...equal to the, two interior and opposite angles ; and the three interior angles of every triangle are equal to two right angles. Let ABC be a triangle, and let one of its sides BC be produced to D ; the exterior angle ACD is equal to the two interior and opposite angles CAB, ABC, and the three interior... | |
 | John Playfair - Euclid's Elements - 1835 - 336 pages
...equal to the two interior and opposite angles ; and (he three interior angles of every triangle are equal to two right angles. Let ABC be a triangle, and let one of its sides EC be produced to D ; the exterior angle ACD is equal to the two interior and opposite angles CAB,... | |
 | Mathematics - 1835 - 684 pages
...produced, the exterior angle shall be equal to the two interior and opposite angles ; and the three angles of every triangle are together equal to two right angles. Let the side В С of the Л TS triangle А В С be produced to D : the exterior angle А С D shall be... | |
 | John Fellows - 1835 - 432 pages
...four. Of the geometrical theorems ascribed to Pythagoras, the following are the principal: that the interior angles of every triangle are together equal to two right angles; that the only polygons which fill up the whole space about a given point, are the equilateral triangle,... | |
 | John Playfair - Geometry - 1836 - 148 pages
...equal to the two interior and opposite angles ; and the three interior angles of every triangle are equal to two right angles. Let ABC be a triangle, and let any of its sides BC be produced to D ; the exterior angle ACD is equal to the two interior and opposite... | |
 | John Playfair - Euclid's Elements - 1837 - 332 pages
...and opposite angles ; and the three interior angles of every triangle are equal to two rightfmgles. Let ABC be a triangle, and let one of its sides BC be produced to D ; the exteripr angle ACD is equal to the two interior and opposite angles CAB, ABC ; and the three... | |
 | Euclid, James Thomson - Geometry - 1837 - 410 pages
...of any triangle be produced, the exterior angle is equal to the two interior and remote angles ; and the three interior angles of every triangle are together equal to two right angles. Let the side BC of the triangle ABC be produced to D : the exterior angle A CD is equal to the two interior... | |
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If a side of any triangle be produced, the exterior angle is equal to the two interior and opposite angles ; and the three interior angles of every triangle are equal to two right angles. 
