Reference Info
Circumferences and Areas of Circles
| Diameter (inches) | Circumference (inches) | Area (Sq. in.) |
|---|---|---|
| 12 3/4 | 40.05531 | 127.67629 |
| 12 7/8 | 40.44801 | 130.19202 |
| 13 | 40.84071 | 132.73229 |
| 13 1/8 | 41.23340 | 135.29711 |
| 13 1/4 | 41.62610 | 137.88647 |
| 13 3/8 | 42.01880 | 140.50037 |
| 13 1/2 | 42.41150 | 143.13882 |
| 13 5/8 | 42.80420 | 145.80181 |
| 13 3/4 | 43.19690 | 148.48934 |
| 13 7/8 | 43.58960 | 151.20142 |
| 14 | 43.98230 | 153.93804 |
| 14 1/8 | 44.37500 | 156.69921 |
| 14 1/4 | 44.76770 | 159.48492 |
| 14 3/8 | 45.16040 | 162.29517 |
| 14 1/2 | 45.55309 | 165.12997 |
| 14 5/8 | 45.94579 | 167.98931 |
| 14 3/4 | 46.33849 | 170.87319 |
| 14 7/8 | 46.73119 | 173.78162 |
| 15 | 47.12389 | 176.71459 |
| 15 1/8 | 47.51659 | 179.67210 |
| 15 1/4 | 47.90929 | 182.65416 |
| 15 3/8 | 48.30199 | 185.66077 |
| 15 1/2 | 48.69469 | 188.69191 |
| 15 5/8 | 49.08739 | 191.74760 |
| 15 3/4 | 49.48009 | 194.82783 |
| 15 7/8 | 49.87278 | 197.93261 |
| 16 | 50.26548 | 201.06193 |
| 16 1/8 | 50.65818 | 204.21580 |
| 16 1/4 | 51.05088 | 207.39421 |
| 16 3/8 | 51.44358 | 210.59716 |
| 16 1/2 | 51.83628 | 213.82465 |
| 16 5/8 | 52.22898 | 217.07669 |
| 16 3/4 | 52.62168 | 220.35328 |
| 16 7/8 | 53.01438 | 223.65440 |
| 17 | 53.40708 | 226.98007 |
| 17 1/8 | 53.79977 | 230.33029 |
| 17 1/4 | 54.19247 | 233.70504 |
| 17 3/8 | 54.58517 | 237.10435 |
| 17 1/2 | 54.97787 | 240.52819 |
| 17 5/8 | 55.37057 | 243.97658 |
| 17 3/4 | 55.76327 | 247.44951 |
| 17 7/8 | 56.15597 | 250.94699 |
| 18 | 56.54867 | 254.46901 |
| 18 1/8 | 56.94137 | 258.01557 |
| 18 1/4 | 57.33407 | 261.58668 |
| 18 3/8 | 57.72677 | 265.18233 |
| 18 1/2 | 58.11946 | 268.80253 |
| 18 5/8 | 58.51216 | 272.44726 |
| 18 3/4 | 58.90486 | 276.11655 |
| 18 7/8 | 59.29756 | 279.81037 |
| 19 | 59.69026 | 283.52874 |
| 19 1/8 | 60.08296 | 287.27165 |
| 19 1/4 | 60.47566 | 291.03911 |
| 19 3/8 | 60.86836 | 294.83111 |
| 19 1/2 | 61.26106 | 298.64766 |
| 19 5/8 | 61.65376 | 302.48874 |
| 19 3/4 | 62.04646 | 306.35438 |
| 19 7/8 | 62.43915 | 310.24455 |
| 20 | 62.83185 | 314.15927 |
| 20 1/8 | 63.22455 | 318.09853 |
| 20 1/4 | 63.61725 | 322.06234 |
| 20 3/8 | 64.00995 | 326.05069 |
| 20 1/2 | 64.40265 | 330.06358 |
| 20 5/8 | 64.79535 | 334.10102 |
| 20 3/4 | 65.18805 | 338.16300 |
| 20 7/8 | 65.58075 | 342.24953 |
| 21 | 65.97345 | 346.36060 |
| 21 1/8 | 66.36615 | 350.49621 |
| 21 1/4 | 66.75884 | 354.65636 |
| 21 3/8 | 67.15154 | 358.84106 |
| 21 1/2 | 67.54424 | 363.05031 |
| 21 5/8 | 67.93694 | 367.28409 |
| 21 3/4 | 68.32964 | 371.54242 |
| 21 7/8 | 68.72234 | 375.82530 |
| 22 | 69.11504 | 380.13272 |
| 22 1/8 | 69.50774 | 384.46468 |
| 22 1/4 | 69.90044 | 388.82118 |
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