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" To find the area of a triangle. RULE.* Multiply the base by the perpendicular height, and half the product will be the area. "
A Course of Mathematics: Designed for the Use of the Officers and Cadets, of ... - Page 318
by Isaac Dalby - 1807
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The Accomplished Tutor: Or, Complete System of Liberal Education ..., Volume 1

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: —...
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The American Tutor's Guide: Being a Compendium of Arithmetic. In Six Parts ...

James Thompson - Arithmetic - 1808 - 176 pages
...and its height 9 feet 3 inches ! Ata. 115/f. 7 in. 6". II. To nd 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...
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The principles of architecture, Volume 1

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.?...
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A Treatise on Surveying, Containing the Theory and Practice: To which is ...

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...
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The complete measurer: or, The whole art of measuring, containing the ...

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...
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A Treatise on Practical Mensuration in Eight Parts ...

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...
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A Popular Course of Pure and Mixed Mathematics ...: With Tables of ...

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....
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The Operative Mechanic, and British Machinist: Being a Practical ..., Volume 1

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 ;...
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An Introduction to Mensuration and Practical Geometry

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....
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The Builder's Practical Guide: Containing a Complete Explanation of the ...

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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