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" RULE. From half the sum of the three sides subtract each side severally. "
The Theory and Practice of Surveying: Containing All the Instructions ... - Σελίδα 163
των Robert Gibson - 1832 - 348 σελίδες
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An Introduction to Mensuration and Practical Geometry

John Bonnycastle - 1829 - 252 σελίδες
...102. 5/e. PROBLEM III. To find the area of a triangle whose three sides only are given. RULE.* . 1 . From half the sum of the three sides subtract each side severally. * Demon. Let AC— a, ±3=b, uc=c, and AD=a:; (See preceding fig.) Then, since BD=&— x, we shall...

Elements of Geometry and Trigonometry: With an Easy and Concise System of ...

James Hale - 1829 - 115 σελίδες
...Perpendicular. RULE 2. If the three Sides of a Triangle be given, its Area may be thus obtained: — From half the sum of the three Sides, subtract each Side severally, then extract the Square Root of the continued Product of the half sum and three remainder for the Area....

Conkling's Arithmetic: The Young Arithmetician's Guide to a Knowledge of ...

Thomas Conkling (W.) - 1831 - 275 σελίδες
...three lines or sides. PROBLEM3. When the sides of a triangle are given, to find the content. . ' ' . RULE. From half the sum of the three sides, subtract each side severally; then, multiply that half sum and the three remainders together; and the sqipre root of the last product...

The American Student's Guide: Containing a Compendious System of Theoretical ...

George Alfred - 1834 - 312 σελίδες
...14 acres 2 roods 32 poks PROBLEM 7. To find the area of a triangle when the three sides are given. RULE. From half the sum of the three sides subtract each side several! y, then multiply the half sum and the three remainders continually together, and the square...

The artillerist's manual, and compendium of infantry exercise

Frederick Augustus Griffiths - 1840
....?i__ =140 Square yards. Area required. To find the Area of a Triangle, whose three Sides are given. From half the sum of the three sides, subtract each side severally ; multiply the half sum, and the three remainders together, and the square root of the product will...

Arithmetical Spyglass and Teacher's Assistant: Intended as a Key and ...

Charles Waterhouse - 1842 - 166 σελίδες
...by means of the given proportion, the other sides may be found. PROB. IV. — To Measure a Triangle. RULE. — From half the sum of the three sides, subtract each side severally ; multiply these three remainders and the said half sum continually together ; the square root of the...

Engineers' and Mechanics' Pocket-book ...

Charles Haynes Haswell - 1844 - 264 σελίδες
...cd, and half the product will be the area. To find the Area of a Triangle by the length of its sides. RULE. — From half the sum of the three sides subtract each side separately ; then multiply the half sum and the \hree remainders continually together, and the square...

Elementary and practical Arithmetic on the inductive system, by analysis and ...

Charles WATERHOUSE - 1844 - 12 σελίδες
...ft.=192 ft., Ans. „ 3. To find the area of a triangle. RULE. — If the three sides only are given. — From half the sum of the three sides, subtract each side severally ; multiply these three remainders and the said half sum continually together ; and the square root...

The operative mechanic's workshop companion, and the scientific gentleman's ...

William Templeton (engineer.) - 1845
...superficies. 7.7^ / /3 =206-34375 square feet, the area. When only the three sides of a triangle can be given, to find the area. Rule. — From half the sum of the three sides, subtract each side severally ; multiply the half sum and the three remainders together, and the square root of the product is equal...

Watson's Tutor's assistant; or, Complete school arithmetic

William Watson (of Beverley.) - 1845 - 180 σελίδες
...chains. Ans. 3a. Or. 18p. PROBLEM 3. — To find the area of a triangle, when three sides are given. RULE. From half the sum of the three sides, subtract each side severally, multiply the lialf sum, and the three • These, and the following, should be laid down with a plotting...




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