 | Almon Ticknor - Arithmetic - 1846 - 274 pages
...diameter? Ans. 5.0929+chains. The diameter given, to find the area or content. RULE. Multiply the sqjiare of the diameter by the decimal .7854, and the product will be the area. 1. How many square feet are contained in a circle, whose diameter is 4 feet 3 inches ? Thus : 4.252... | |
 | William Vogdes - Arithmetic - 1847 - 324 pages
...is its diameter ? 3. What is the diameter of a circle whose circumference is 128 feet? PROBLEM XIX. To find the area of a circle. RULE. Multiply the square of the diameter by .7854, and the product will be the area. Or multiply the square of the circumference by .07958, and... | |
 | Isaac Ridler Butts - 1852 - 596 pages
...together, and divide the Product by 1728 to obtain the Cubic Fret. CIRCLES. To find the area of a Circle multiply the square of the Diameter by the Decimal -7854, and the Product will be ihe area [The square of any number is that number multiplied by itself. Thus: 2x2 = 4,=*/ie square... | |
 | Ezra S. Winslow - Business mathematics - 1853 - 264 pages
...is the diameter of a circle that contains an area of 784 square feet? ' * MENSURATION OF SUPERFICES. To find the area of a circle. RULE. — Multiply the square of the diameter by .7854, (.785398) ; or, multiply the square of the circumference by .07958 ; or, multiply half the circumference... | |
 | Henry James Castle - Surveying - 1856 - 220 pages
...circumference of a circle, when the arc of 30° measures 17 chains 20 links? Answer 206-40 chains. PROBLEM X. To find the area of a circle. Rule. Multiply the square of the diameter by -7854. EXAMPLE 1. What is the area of a circular field, whose diameter is 18 chains? 182 X -7854 =... | |
 | Silas Lawrence Loomis - Arithmetic - 1859 - 324 pages
...CXIV. — To FIND THE DIAMETER OF A CIRCLE. RULE. — Divide the circumference by n. PROB. CXV. — To FIND THE AREA OF A CIRCLE. RULE. — Multiply the square of the diameter by £ *; or \ the product of the circumference and diameter; or the product of half the diameter, by half... | |
 | Northern Wisconsin Agricultural and Mechanical Association - Agriculture - 1877 - 244 pages
...cubic feet; then multiply by 4 and divide by 5, as in the above rule. To find the capacity of cisterns: Rule. — Multiply the square of the diameter by the decimal .7854, and this product by the depth of the cistern in inches; divide by 231 and the result will be gallons; then... | |
 | John Jacob Thomas - Agriculture - 1878 - 360 pages
...diameter by 3.1416, and the product will be the circumference, (fig. 386.) To find the area of a circle : Multiply the square of the diameter by the decimal .7854, and the product will be the area, (fig. 387.) To find the area of an ellipse : Multiply the long diameter by the short one, and the product... | |
 | Charles Talbot Porter - Indicators for steam-engines - 1883 - 224 pages
...3«6-3 316.6 316.9 If the areas of larger cylinders are required, they will be found by the following RULE : — Multiply the square of the diameter by...the decimal .78(54, and the product will be the area in square inches; or, multiply half the circumference by half the diameter. TABLE No. H. Showing the... | |
 | Frank Eugene Kidder - Architecture - 1892 - 1032 pages
...Rise = rad — y'rad2 — Jchord'2 = 51 — V/2001 — 57(i = 51 — 45 = (i inches = rise. To compute the area of a circle. RULE. — Multiply the square of the diameter by 0.7854, or multiply the square of the radius by 3. 1410. EXAMPLE. — What is the area of a circle... | |
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TO FIND THE AREA OF A CIRCLE. Rule. — Multiply the square of the diameter by .7854 and the product will be the area. 
