 | Popular educator - 1872 - 848 pages
...c B together moke up the angle DCS, which is therefore equal to the angles c BA, BA c. 7. The three interior angles of every triangle are together equal to two right angles. In Fig. 5 the angle BCD has been shown to be equal to the angles c BA, BA c ; to each of these equala... | |
 | Euclides, James Hamblin Smith - Geometry - 1872 - 376 pages
...triangle le produced, the exterior angle is equal to the two interior and opposite angles, and the three interior angles of every triangle are together equal to two right angles. Let ABC be a A , and let one of its sides, BC, be produced to D. Then ititt I. / ACD = LB ABC, BAC... | |
 | Herbert Spencer - Psychology - 1873 - 670 pages
...triangle be produced, tho exterior angle is equal to the two interior and opposite angles ; and the three interior angles of every triangle are together equal to two right angles. " Let ABC be a triangle, and let one of its sides BC be produced to D ; then the exterior angle ACD... | |
 | Herbert Spencer - 1873 - 678 pages
...triangle be produced, the exterior angle is equal to the two interior and opposite angles ; and the three interior angles of every triangle are together equal to two right angles. " Let ABC be a triangle, and let one of its sides BC be produced to D ; then the exterior angle ACD... | |
 | Francis Cuthbertson - Euclid's Elements - 1874 - 400 pages
...triangle be produced, the exterior angle is equal to the two interior and opposite angles; also the three interior angles of every triangle are together equal to two right angles. Jf & Let ABC be a A , and let one of its sides ISCbe produced to K. Then shall i ACK be equal to the... | |
 | Braithwaite Arnett - 1874 - 130 pages
...triangle be produced, the exterior angle is equal to the two interior and opposite angles ; and the three interior angles of every triangle are together equal to two right angles. 4. Prove that the angle between the bisectors of two consecutive angles of a quadrilateral is half... | |
 | Euclides - 1874 - 342 pages
...triangle be produced, the exterior angle is equal to thutwo interior and opposite angles ; and the three interior angles of every triangle are together equal to two right angles. Let ABC be a triangle, and let one of its sides BC be produced toD. Then the exterior angle ACD shall... | |
 | Education Department,London - 1876 - 1010 pages
...angled isosceles triangles have their bases equal, they will be equal in all respects. 3. The three interior angles of every triangle are together equal to two right angles. SECTION ะจ. 1. Triangles upon equal bases and between the tame parallels are equal to each other. If... | |
 | Henry Major - 1876 - 784 pages
...triangle be produced, the exterior angle is1 equal to the two interior and opposite angles ; and the three interior angles of every triangle are together equal to two right angles. . The base angle of an isosceles triangle is one-fourth of the vertical angle, and from it a line is... | |
 | 1876 - 400 pages
...Construct the triangle when each side is equal to half the sum of the other two. SECTION III. 1 . The three interior angles of every triangle are together equal to two right angles. What ratio does the angle of a regular hexagon bear to a rig] it angle? 2. Triangles upon the same... | |
| |
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 together equal to two right angles. 
