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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. "
An Introduction to Mensuration and Practical Geometry - Page 54
by John Bonnycastle - 1829 - 252 pages
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The Accomplished Tutor; Or, Complete System of Liberal Education ..., Volume 1

Thomas Hodson - Arithmetic - 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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A Course of Mathematics: Designed for the Use of the Officers ..., Volumes 1-2

Isaac Dalby - Mathematics - 1807 - 968 pages
...remaining shall be equal to 5 square 1ч i ? Ans. lOj'r inches. To find the urea of a Trianglt, 257. MULTIPLY the base by the perpendicular height, and half the product will be the area. Or multiply the base by half the height, or the height by halt the base. • For a triangle U equal...
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A Course of Mathematics ...: Designed for the Use of the Officers ..., Volume 1

Isaac Dalby - Mathematics - 1807 - 476 pages
...shall be equal to 5 square feet? Ans. 10TV inches. To find the urea of a Triangle. 257. MuLTiPLYthe base by the perpendicular height, and half the product will be the area. Or multiply the base by half the height, or the height by half the base. For a triangle is equal to...
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The American Tutor's Guide: Being a Compendium of Arithmetic. In Six Parts ...

James Thompson - Arithmetic - 1808 - 176 pages
...whose length is 12 feet 6 inches, 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...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
...32.5P. 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
...area of the parallelogram, viz. A cxc D x natural sine of the angle c — the area. PROBLEM IV. Tofind the Area of a Triangle. RULE. Multiply the base by...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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New American Practical Navigator

Nautical astronomy - 1821 - 708 pages
...Multiply the base 30 feet by the perpendicular 15 feet; the product 460 is tlic •. / area in square feet. PROBLEM II. To find the area of a Triangle. RULE. Multiply the base by half the perpendicular height, and the product will be the area required. A a 178 EXAMPLE. Given the...
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The Operative Mechanic, and British Machinist: Being a Practical ..., Volume 1

John Nicholson - Machinery - 1825 - 822 pages
...area of a rhombus, whose length is 6 chains, and perpendicular height 5. — 6 5 Ansr. 30 Prol. 2. To find the Area of a Triangle. Rule ] . Multiply...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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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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