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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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The United States Arithmetic: Designed for Academies and Schools

William Vogdes - 1847 - 256 σελίδες
...the height 12 perches : how many acres does it contain ? PROBLEM XI. Given three sides of a triangle, 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 continually together, and the square root of the product...

The Decorator's assistant

...that is, equal to 12 sq. in. PROBLEM III. To find the area of a triangle, whose three sides are given. From half the sum of the three sides subtract each side severally, then multiply the half sum and the three remainders continually together, and the square root of the...

A Complete Treatise on Practical Land-surveying, in All Its Departments ...

Anthony Nesbit - 1847 - 426 σελίδες
...foregoing method. 4. When the three sides of a triangle are given, the area may be found as follows. From half the sum of the three sides subtract each side severally ; multiply the half sum and the three remainders continually together, and the square root of the last...

Principles of geometry, mensuration, trigonometry, land-surveying, and ...

Thomas Tate (mathematical master.) - 1848
...perpendicular 25-25 ft. ? Ans. 68-736. 3. PROBLEM. To find the area of a triangle, given the three sides. RULE. From half the sum of the three sides subtract each side severally ; multiply the half sum and the three remainders continually together, and the square root of the last...

A Treatise on Surveying and Civil Engineering, Wherein Everything that is ...

P. O'Shaughnessy (Civil engineer) - 1848 - 98 σελίδες
...feet ? Ans. 2748. 9. Prob. 5. To find the area of a plain triangle when the three sides are given. Rule. — From half the sum of the three sides subtract each side severally. Multiply the half sum and the three remainders continually together, the square root of the product...

An Introduction to Mensuration and Practical Geometry

John Bonnycastle - 1848 - 288 σελίδες
...Ans. 102.5ye. PROBLEM 111. 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=iJ, AB=6, xc—c, and AD=ar/ (See preceding fig.) Then, since uii:=6 — x, we shall...

The Mechanic's Assistant: A Thorough Practical Treatise on Mensuration and ...

D. M. Knapen - 1849 - 276 σελίδες
...is 45 rods ? Ans. 5.48 acres. When the sides of H scalene triangle are given, to find its area : — From half the sum of the three sides subtract each side severally ; then multiply together the half sum of the three sides, and the three remainders, and extract the...

An introductory treatise on mensuration, in theory and practice

John Radford Young - 1850 - 12 σελίδες
...Ans. 28-2 yards. PROBLEM IV. — To find the area of a triangle when all its three sides are given. 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 of these...

A Rudimentary Treatise on Land and Engineering Surveying: With All the ...

Thomas Baker - 1850 - 218 σελίδες
...has been made, and the work must be repeated. TO FIND THE AREA OF A TRIANGLE FROM THE THREE SIDES. RULE. From half the sum of the three sides subtract each side severally and reserve the three remainders; multiply the half sum continually by the three remainders, and the...

A THEORETICAL AND PRACTICAL ARITHMETIC

DANIEL LEACH, WILLIAM D. SWAN - 1851
...is 80 yards ? 364. To find the area of a triangle, when the length of its three sides is known,— RULE. From half the sum of the three sides subtract each side separately. Then multiply the half sum by each side in succession. The square root of the continued...




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