Area Of A Circle
Description
This section is from the book "Principles And Practice Of Plumbing", by John Joseph Cosgrove. Also available from Amazon: Principles and Practice of Plumbing.
Area Of A Circle
To find the area of a circle, square the diameter and multiply by .7854. Squaring the diameter means multiplying the length of the diameter by itself.
Example
What is the area of a circle having a diameter of 20 feet ? Solution-20X20X.7854=314.16 square feet. Answer.
Diameter Of A Circle
When the area of a circle is known, the diameter can be found by dividing the area by .7854 and extracting the square root.
Example
What is the diameter of a circle having an area of 314.16 square feet ?
Solution
314.16/.7854=400 and square root of 400=20 feet. Answer.
A table of American equivalents of metric measurements follows:
Table LXV - American Equivalents Of Metric Measures Linear American To Metric
Inches to Millimeters | Feet to Meters | Yards to Meters | Miles to Kilometers | |
1 equals . . | 25.4001 | 0.304801 | 0.914402 | 1.60935 |
2 equal . . | 50.8001 | 0.609601 | 1.828804 | 3.21869 |
3 equal . . | 76.2002 | 0.914402 | 2.743205 | 4.82804 |
4 equal . . | 101.6002 | 1.219202 | 3.657607 | 6.43739 |
5 equal . . | 127.0003 | 1.524003 | 4.572009 | 8.04674 |
6 equal . . | 152.4003 | 1.828804 | 5.486411 | 9.65608 |
7 equal . . | 177.8004 | 2.133604 | 6.400813 | 11.26543 |
8 equal . . | 203.2004 | 2.438405 | 7.315215 | 12.87478 |
9 equal . . | 228.6005 | 2.743205 | 8.229616 | 14.48412 |
METRIC TO AMERICAN | ||||
Meters to Inches | Meters to Feet | Meters to Yards | Kilometers to Miles | |
1 equals . . | 39.3700 | 3.28083 | 1.093611 | 0.62137 |
2 equal . . | 78.7400 | 6.56167 | 2.187222 | 1.24274 |
3 equal . . | 118.1100 | 9.84250 | 3.280833 | 1.86411 |
4 equal . . | 157.4800 | 13.12333 | 4.874444 | 2.48548 |
5 equal . . | 196.8500 | 16.40417 | 5.468056 | 3.10685 |
6 equal . . | 236.2200 | 19.68500 | 6.561667 | 3.72822 |
7 equal . . | 275.5900 | 22.96583 | 7.655278 | 4.34959 |
8 equal . . | 314.9600 | 26.24667 | 8.748889 | 4.97096 |
9 equal . . | 354.3300 | 29.52750 | 9.842500 | 5.59233 |
SQUARE AMERICAN TO METRIC | ||||
Square Inches to Square Centimeters | Square Feet to Square Decimeters | Square Yards to Square Meters | Acres to Hectares | |
1 equals . . | 6.452 | 9.290 | 0.836 | 0.4047 |
2 equal . . | 12.903 | 18.581 | 1.672 | 0.8094 |
3 equal . . | 19.355 | 27.871 | 2.508 | 1.2141 |
4 equal . . | 25.807 | 37.161 | 3.344 | 1.6187 |
5 equal . . | 32.258 | 46.452 | 4.181 | 2.0234 |
6 equal . . | 38.710 | 55.742 | 5.017 | 2.4281 |
7 equal . . | 45.161 | 65.032 | 5.853 | 2.8328 |
8 equal . . | 51.613 | 74.323 | 6.689 | 3.2875 |
9 equal . . | 58.065 | 83.613 | 7.525 | 3.6422 |
METRIC TO AMERICAN | ||||
Square Centimeters to Square Inches | Square Meters to Square Feet | Square Meters to Square Yards | Hectares to Acres | |
1 equals . . | 0.1550 | 10.764 | 1.196 | 2.471 |
2 equal . . | 0.3100 | 21.528 | 2.392 | 4.942 |
3 equal . . | 0.4650 | 32.292 | 3.588 | 7.413 |
4 equal . . | 0.6200 | 43.055 | 4.784 | 9.884 |
5 equal . . | 0.7750 | 53.819 | 5.980 | 12.355 |
6 equal . . | 0.9300 | 64.588 | 7.176 | 14.826 |
7 equal . . | 1.0850 | 75.347 | 8.372 | 17.297 |
8 equal . . | 1.2400 | 86.111 | 9.568 | 19.768 |
9 equal . . | 1.3950 | 96.874 | 10.764 | 22.239 |
Table LXV - Continued - Cubic American To Metric
Cubic Inches to Cubic Centimeters | Cubic Feet to Cubic Meters | Cubic Yards to Cubic Meters | Bushels to Hectoliters | |
1 equals . . | 16.387 | 0.02832 | 0.765 | 0.35242 |
2 equal . . | 32.774 | 0.05663 | 1.529 | 0.70485 |
3 equal . . | 49.161 | 0.08495 | 2.294 | 1.05727 |
4 equal . . | 65.549 | 0.11327 | 3.058 | 1.40969 |
5 equal . . | 81.936 | 0.14158 | 3.823 | 1.76211 |
6 equal . . | 98.323 | 0.16990 | 4.587 | 2.11454 |
7 equal . . | 114.710 | 0.19822 | 5.352 | 2.46696 |
8 equal . . | 131.097 | 0.22654 | 6.116 | 2.81938 |
9 equal . . | 147.484 | 0.25485 | 6.881 | 3.17181 |
METRIC TO AMERICAN | ||||
Cubic Centimeters to Cubic Inches | Cubic Decimeters to Cubic Inches | Cubic Meters to Cubic Feet | Cubic Meters to Cubic Yards | |
1 equals . . | 0.0610 | 61.023 | 35.314 | 1.308 |
2 equal . . | 0.1220 | 123.047 | 70.629 | 2.616 |
3 equal . . | 0.1831 | 183.070 | 105.943 | 3.924 |
4 equal . . | 0.2441 | 244.093 | 141.258 | 5.232 |
5 equal . . | 0.3051 | 305.117 | 176.572 | 6.540 |
6 equal . . | 0.3661 | 366.140 | 211.887 | 7.848 |
7 equal . . | 0.4272 | 427.163 | 247.201 | 9.156 |
8 equal . . | 0.4882 | 488.187 | 282.516 | 10.464 |
9 equal . . | 0.5492 | 549.210 | 317.830 | 11.771 |
WEIGHT AMERICAN TO METRIC | ||||
Grains to Milligrams | Avoirdupois Ounces to Grams | Avoirdupois Pounds to Kilograms | Troy Ounces to Grams | |
1 equals . . | 64.7989 | 28.3495 | 0.45359 | 31.10348 |
2 equal . . | 129.5978 | 56.6991 | 0.90719 | 62.20696 |
3 equal . . | 194.3968 | 85.0486 | 1.36078 | 93.81044 |
4 equal . . | 259.1957 | 113.3981 | 1.81437 | 124.41392 |
5 equal . . | 323.9946 | 141.7476 | 2.26796 | 155.51740 |
6 equal . . | 388.7935 | 170.0972 | 2.72156 | 186.62089 |
7 equal . . | 453.5924 | 198.4467 | 3.17515 | 217.72437 |
8 equal . . | 518.3914 | 226.7962 | 3.62874 | 248.82785 |
9 equal . . | 583.1903 | 255.1457 | 4.08233 | 279.93133 |
METRIC TO AMERICAN | ||||
Milligrams to Grains | Kilograms to Grains | Hectograms (100 Grams) to Ounces, Av. | Kilograms to Pounds, Av. | |
1 equals . . | 0.01543 | 15,432.36 | 3.5274 | 2.20462 |
2 equal . . | 0.03086 | 30,864.71 | 7.0548 | 4.40924 |
3 equal . . | 0.04630 | 46,297.07 | 10.5822 | 6.61386 |
4 equal . . | 0.06173 | 61,729.43 | 14.1096 | 8.81849 |
5 equal . . | 0.07716 | 77,161.78 | 17.6370 | 11.02311 |
6 equal . . | 0.09259 | 92,594.14 | 21.1644 | 13.22773 |
7 equal . . | 0.10803 | 108,026.49 | 24.6918 | 15.48235 |
8 equal . . | 0.12346 | 123,458.85 | 28.2192 | 17.63697 |
9 equal . . | 0.13889 | 138,891.21 | 31.7466 | 19.84159 |
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