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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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Robinson's New Practical Arithmetic for Common Schools and Academies

Horatio Nelson Robinson - 1892 - 416 σελίδες
...(30 + 40 + 50) -4- 2 = 60 ; 60 - 30 = 30 ; 60 - 40 = 20 ; 60 - 50 = 10. V60x30x20xlo' = 600 sq. ft. , area. RULE. — From half the sum of the three sides subtract each side separately ; multiply the half-sum and the three remainders together; the square root of the product...

Robinson's New Practical Arithmetic for Common Schools and Academies

Horatio Nelson Robinson - 1892 - 416 σελίδες
...40 + 50) -=- 2 = 60 ; 60 - 30 = 30 ; 60 - 40 = 20; 60 - 50 = 10. \X60~x30 x 20 x 10 = 600 sq. ft., area. RULE. — From half the sum of the three sides subtract each side separately; multiply the half-sum and the three remainders together; the square root of the product...

Public Documents of Massachusetts, Τόμοι 19-31

Massachusetts - 1893
...one-half the product of the side and perpendicular, and divide by 160. (ft) When three sides are given. Rule. — From half the sum of the three sides subtract each side separately ; multiply the half sum and the three remainders together; the square root of the product...

The Mechanical Engineer's Pocket-book: A Reference Book of Rules, Tables ...

William Kent - 1895 - 1100 σελίδες
...altitude. RULE a. Multiply half the product of two sides by the sine of the Included angle. Ri'LE 3. From half the sum of the three sides subtract each side severally; multiply together the half sum and the three remainders, and extract the square root of the product....

Machinists' and Draftsmen's Handbook: Containing Tables, Rules, and Formulas ...

Peder Lobben - 1899 - 438 σελίδες
...the same area. To Figure the Area of Any TriangIe when Only the Length of the Three Sides is Given. RULE. From half the sum of the three sides subtract each side separately ; multiply these three remainders with each other and the product by half the sum of the...

Famous Geometrical Theorems and Problems, with Their History, Μέρος 1

William Whitehead Rupert - 1900 - 107 σελίδες
...God, for which reason He always is God." CHAPTER V. THE AREA OF A TRIANGLE IN TERMS OF ITS SIDES. 48. RULE. — From half the sum of the three sides subtract each side separately ; multiply together the half sum and the three remainders and extract the square root of...

A Textbook on Sheet-metal Pattern Drafting, Τόμος 1

...63. When the three sides of • • a triangle are given, its area is found by the following rule: Rule. — From half the sum of the three sides, subtract each side separately; find the continued product of the half sum of the sides and thc three remainders; the square...

The Business Man's Arithmetic: Containing an Application of a Natural ...

James Sherman Hunter - 1902 - 71 σελίδες
...all very brief by canceling. To find the area of any triangle when the three sidtt 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 Mechanical Engineer's Pocket-book: A Reference Book of Rules, Tables ...

William Kent - 1907 - 1129 σελίδες
...altitude. RULE 2. Multiply half the product of two sides by the sine of the Included angle. RULES. From half the sum of the three sides subtract each side severally; multiply together the half sum and the three remainders, and extract the square root of the product....

Practical Mechanical Drawing and Machine Design, Self Taught ...

Charles Westinghouse - 1906 - 157 σελίδες
...(SC) Sum of sides To find the area of any oblique angled triangle when only the 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 products is equal...