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... and 48° 15'? Ans. 6 A. 3 R. 18 P. PROBLEM V. To find the area of a triangle when the three sides are given. RULE. From half the sum of the three sides...
A Treatise on Surveying and Civil Engineering, Wherein Everything that is ... - Page 7
by P. O'Shaughnessy (Civil engineer) - 1848 - 98 pages

## A Treatise on Surveying: Containing the Theory and Practice: to which is ...

John Gummere - 1828 - 406 pages
...and.48°15'? Ans. 6 A. 3R. 18 P. PROBLEM V. To find the. area of a triangle when the three sides are given. From half the sum of the three sides subtract each...sum and the three remainders continually together, and the square root of the last product will be the area.* * DEMONSTRATION. Let ABC, Fig. 69, be the...

## A Treatise on Surveying: Containing the Theory and Practice: to which is ...

John Gummere - 1828 - 394 pages
...adjacent angles 37° 30' , and 48° 1 5' ? Алs. 6 A. 3 R. 18 P. PROBLEM V. To find the area of a triangle when the three sides are given. RULE. From half the sum of the three sides subfr&ct each side severally; multiply the half sum and the three remainders continually together,...

## A Short System of Practical Arithmetic: Compiled from the Best Authorities ...

William Kinne - 1829 - 248 pages
...the corner a true right-angle. RULE 2. — To find the area of any triangle when the three sides only are given, RULE. — From half the sum of the three sides' subtract each side severally ; multiply these three remainders and the said half sum continually together; then the square root of the last...

## An Introduction to Mensuration and Practical Geometry

John Bonnycastle - 1829 - 252 pages
...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 pages
...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 pages
...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...

## A Short System of Practical Arithmetic: Compiled from the Best Authorities ...

William Kinne - 1831 - 248 pages
...the corner a true rightangle. RULE 2.— To find the area of any triangle when the thret RULE.—From half the sum of the three sides subtract each side severally ; multiply these three remainders and the said half sum continually together; then the square root of the last...

## The Theory and Practice of Surveying: Containing All the Instructions ...

Robert Gibson - 1832 - 290 pages
...problem will be evident. PROBLEM VIII. The three' tidet of a plane triangle given, to find the area. RULE.* From half the sum of the three sides subtract each side severally; take the logarithms of half the sum and three remainders, and half their total will be the logarithm...