| ...arc *it, being very small, differs insensibly from the straight line joining the points «it; and the **area of a triangle is equal to half the product of its base,** and the perpendicular from its vertex. Again, the angle t E *! being very small, the perpendicular... | |
| Timothy Walker - 1829 - 129 sider
...D=ABEF, and the area of ABCD==AB xB E, this being the measure of ABEF (100). 102. — The area of any **triangle is equal to half the product of its base by its** altitude — . By the altitude of a triangle we mean a perpendicular let fall from one of the vertices... | |
| Society for the Diffusion of Useful Knowledge (Great Britain) - 1834
...Si t, being very small, differs insensibly from the straight line joining the points s, t ; and the **area of a triangle is equal to half the product of its base,** and the perpendicular from its vertex. Again, the angle t E s, being very small, the perpendicular... | |
| Benjamin Peirce - 1835 - 97 sider
...known. Solution. Let ABC (fig. 2.) be the triangle to be measured, and G the given side. The area of the **triangle is equal to half the product of its base by its** altitude, or Area of AB C = £ bp. But, by (203), sin. b : sin. B : : c : b, vrhence (391) sin. Fig.... | |
| Charles Davies - 1838 - 288 sider
...The side BA or the side AC, opposite the right angle, is called the hypothenuse.' The area or content **of a triangle is equal to half the product of its base by its** altitude. EXAMPLES. 1. The base of a triangle is 40 yards and the perpendicular 20 yards : what is... | |
| George Leonard (Jr.) - 1839 - 347 sider
...portions of the circumference so small that they may be considered straight lines. The surface of each **triangle is equal to half the product of its base by its** altitude, the altitude being the radius ; the surface of all these triangles, then, or the surface... | |
| George Leonard - 1841 - 340 sider
...portions of the circumference so small that they may be considered straight lines. The surface of each **triangle is equal to half the product of its base by its** altitude, the altitude being the radius ; the surface of all these triangles, then, or The surface... | |
| Charles Davies - 1844 - 340 sider
...The side BA or the side AC, opposite the right angle, is called the hypothenuse. The area or content **of a triangle is equal to half the product of its base by its** altitude. EXAMPLES. 1. The base of a triangle is 40 yards and the perpen dicular 20 yards : what is... | |
| Benjamin Peirce - 1845 - 449 sider
...known. Solution. Let ABC (fig. 2) be the triangle to be measured, and c the given side. The area of the **triangle is equal to half the product of its base by its** altitude, or area of ABC = £bp. (273) But, by (130), sin. C : sin. B : : c : b, whence _ c sin. B... | |
| Benjamin Peirce - 1845 - 449 sider
...known. Solution. Let ABC (fig. 2) be the triangle to be measured, and с the given side. The area of the **triangle is equal to half the product of its base by its** altitude, or area of ABC = i bp. (273) But, by (130), sin. С : sin. В : : с : Ь, whence . с sin.... | |
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