| Edward Brooks - Geometry - 1868 - 275 pages
...having equal altitudes are as their bases j having equal bases, they are as their altitudes. THEOREM IV. **The area of a trapezoid is equal to one-half the sum of the** parallel sides multiplied by the altitude. For, draw the diagonal AC, dividing the trapezoid into the... | |
| George Albert Wentworth - Geometry - 1877 - 402 pages
...triangles are to each other as the product of their bases by their altitudes. PROPOSITION VI. THEOREM. 327. **The area of a trapezoid is equal to one-half the sum of the** parallel sides multiplied by the altitude. NEC AFB Let ABC H be a trapezoid, and EF the altitude. We... | |
| Albert Newton Raub - Arithmetic - 1877 - 333 pages
...by Geometry : 1. The area of any parallelogram is equal to the product of its base and altitude. 2. **The area of a trapezoid is equal to one-half the sum of** its parallel sides, multiplied by its altitude. 1. What is the area of a room 15 ft. long, 9 ft. 6... | |
| George Albert Wentworth - Geometry, Plane - 1879 - 250 pages
...triangles are to each other as the product of their bases by their altitudes. PROPOSITION VI. THEOREM. 327. **The area of a trapezoid is equal to one-half the sum of the** parallel sides multiplied by the altitude. HEC AFB Let ABC H be a trapezoid, and EF the altitude. We... | |
| Education - 1890
...angle formed by a tangt-nt and a chord is measured by one-half of the intercepted arc. :¡. J'l-nre: **The area of a trapezoid is equal to one-half the sum of the** parallel sides multiplied by the altitude. 4. Find the area of a circle inscribed in a square containing... | |
| George Albert Wentworth - Geometry - 1884 - 406 pages
...to each other as the product of their bases by their altitudes. PROPOSITION VI. THEOREM. 327. Thе **area of a trapezoid is equal to one.half the sum of the** parallel sides multiplied hil f lie altitude. II E С' AF В Let ABC H be a trapezoid, and EF the altitude.... | |
| Webster Wells - Geometry - 1886 - 371 pages
...areas of the trapezoids Ab, Be, etc., whose common altitude is Hh, the slant height of the frustum. But **the area of a trapezoid is equal to one-half the sum of** its parallel sides multiplied by its altitude (§ 331). PROPOSITION XIX. THEOREM. 564. A triangular... | |
| William C. Bartol - Geometry, Solid - 1893 - 95 pages
...their bases; any two triangles are to each other as the product of their bases by their altitudes. 366. **The area of a trapezoid is equal to one-half the sum of the** parallel sides multiplied by the altitude. 367. I. A circle may be circumscribed about a regular polygon.... | |
| Webster Wells - Arithmetic - 1893 - 339 pages
...product of its base and altitude. 3. The area of a square is equal to the square of one of its sides. 4. **The area of a trapezoid is equal to one-half the sum of** its bases, multiplied by its altitude. It is important to observe that, in finding the product of two... | |
| George Albert Wentworth, George Anthony Hill - Geometry - 1894 - 138 pages
...increased by twice the product of one of these sides and the projection of the other side upon it. 7. **The area of a trapezoid is equal to one-half the sum of** its parallel sides multiplied by its altitude. HARVARD COLLEGE, June, 1892. In solving problems use... | |
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