 | 1818 - 264 σελίδες
...how far are we from the Sun ? Ans. 95,000,000miles. PROBLEM VII. To Jind the Area of a circle. RULE. Multiply the square of the diameter by .7854 OR Multiply half the diameter into half the circumference. Ex. I. What is the area of a circle whose diameter is 623 ? Ans.... | |
 | Euclid, Dionysius Lardner - 1828 - 542 σελίδες
...degree of approximation (634). The following practical rule may be derived from (634) and (636). • To find the area of a circle multiply the square of the radius by 31415, and divide the result by 10000.' This will give the area, subject to an error of less... | |
 | 1836 - 488 σελίδες
...the number of degrees in the arc; so is the circumference of the circle, to the length of the arc. To find the area of a circle. Multiply the square of the diameter by the decimals .7854. Or, multiply half the diameter into half the circumference. Or, multiply the whole... | |
 | Hugo Reid - 1838 - 234 σελίδες
...inch. To find the number of square inches in a circular area, multiply the square of the inches in its diameter by .7854 ; or, multiply half the circumference by half the diameter. The area of a circle is a little more than three-fourths, and a little less than four-fifths of the... | |
 | Roswell Chamberlain Smith - 1841 - 324 σελίδες
...square inscribed in a circle -.—Multiply the diameter by .707016. tr the circumference by .255079. 5. To find the area of a circle :— Multiply the square of the diameter by .785398, or tit* tquate of the circumference by .079577525. 6. Te lind the diameter of a elide:—... | |
 | Roswell Chamberlain Smith - 1842 - 320 σελίδες
...inscribed in a circle : — Multiply the diameter by .707016, or the circumference by .2251)79. 5. To find the area of a circle -.—Multiply the square of the diameter by .785398, or the square of the circumference by .0711577525. 6. To Hud the diameter ofa circle: —... | |
 | Roswell Chamberlain Smith - 1843 - 320 σελίδες
...square inscribed in a circle;—Multiply the diameter by .707016, or the circumference by .225079. 5. To find the area of a circle -.—Multiply the square of the diameter by .785398, or tks tquare of the circumference by .079577525. 6. To find the diameter of a circle:—Multiply... | |
 | William Scott - 1845 - 288 σελίδες
...s=Ja*,' or, since d=2r, rfazz4r2: whence, by substitution, 1 : 4r2 :: ^ : s, .-. 8=тгг2. Consequently, to find the area of a circle, Multiply the square of the diameter of the circle by .7854: or Multiply the square of the radius of the circle by 3.1416 : the product... | |
 | Roswell Chamberlain Smith - 1850 - 314 σελίδες
...square inscribed in a circle '.—Multiply the diameter by .707016, tr the circumference by .225079. 5. To find the area of a circle '.—Multiply the square of the diameter by .785398, or the \quare of the circumference by .079577525. 6. To find the diameter of a circle: —... | |
 | James Robinson - 1850 - 342 σελίδες
...the circle is the base. From this analogy we derive the rule for finding the area of a circle, viz., Multiply half the circumference by half the diameter ; or, multiply the circumference by one fourth of the diameter. The area of a circle is .7854 of its circumscribing square, and the... | |
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To find the area of a circle, multiply the square of the diameter by .7854. 
