| Thomas Hodson - Education - 1806 - 502 pages
...FIG. g. The area of all triangles is found by- the following rules : — RULE i. Multiply the bafe **by the perpendicular height, and half the product will be the area.** But when only the three fides of the triangle are given, the area is found by the following rule: —... | |
| James Thompson - Arithmetic - 1808 - 176 pages
...and its height 9 feet 3 inches ! Ata. 115/f. 7 in. 6". II. To ßnd the area of a triangle. RULE — **Multiply the base by the perpendicular height, and half the product will be** theurea. EXAMPLES. 9. Required the area of the triangle whose base is 10 feet 9 inches, and height... | |
| Peter Nicholson - 1809 - 426 pages
...whose length AB is l6f. 3i. and the height DE 5f. 6i. ? PROBLEM II. To find the area of a triangle. **Multiply the base by the perpendicular height, and half the product will be the area.** EXAMPLE 1. I What is the area of a triatgk ABC, the base AB being 12f. 3i. and the height BC 8f. 6i.?... | |
| John Gummere - Surveying - 1814 - 398 pages
...PROBLEM II. To find the area of a triangle when the base and per pendicular height are given. RULE. **Multiply the base by. the perpendicular height, and half the product will be the area.*** • DEMONSTRATION. A triangle is half a parallelogram of the same base and altitude (41.1.), and therefore... | |
| Thomas Keith - 1817 - 306 pages
...cxc D x natural sine of the angle c — the area. PROBLEM IV. Tofind the Area of a Triangle. RULE. **Multiply the base by the perpendicular height, and half the product will be the area** *. Example 1. If the base of a triangle be 15'4 inches, and the perpendicular 7'8 inches, what is the... | |
| Anthony Nesbit - Surveying - 1824 - 476 pages
...triangle, when the .base and perpendicular are given. RULE. Multiply the base by the perpendicular, **and half the product will be the area. Or, multiply the base by half the** perpendicular ; or the perpendicular by half the base, and the product will be the area. Aote 1. If... | |
| Peter Nicholson - Mathematics - 1825 - 1046 pages
...8125 f. 89.375 Л 89 4 6 f. i ii Ans. 89 ft. 4 in. 6 parts. Prob. 2. To find the area of a triangle. **Multiply the base by the perpendicular height, and half the product will be the area.** Ex. What is the area of a triangle ABC, the base AB being 12f. 3i. and the height CD 8f. 6i. ? By duodecimals.... | |
| John Nicholson - Machinery - 1825 - 822 pages
...chains, and perpendicular height 5. — 6 5 Ansr. 30 Prol. 2. To find the Area of a Triangle. Rule ] . **Multiply the base by the perpendicular height, and half the product will be the area.** Rule 2. When the three sides only are given : Add the three sides together, and take half the sum ;... | |
| John Bonnycastle - Geometry - 1829 - 256 pages
...is 12£ feet, and breadth 9 inches. Ans. 9f feet. PROBLEM II. To find the area of a triangle. RULE.* **Multiply the base by the perpendicular height, and half the product will be the area.** Note. — The perpendicular height of the triangle is equal to twice the area divided by the base.... | |
| John Nicholson (Civil engineer) - Building - 1830 - 240 pages
...chains, and perpendicular height 5. 5 5 Ansr. 30 Prob. 2. To find the Area of a Triangle. Rule 1 . **Multiply the base by the perpendicular height, and half the product will be the area.** Rule 2. When the three sides only are given : Add the three sides together, and take half the sum ;... | |
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