| Size in Inches | Circumference Inches | Area in Square Inches | Area in Square Inches | Size in Inches | Circumference Inches | Area in Square Inches | Area in Square Inches |
| 1/4 | 0.785 | 0.049 | 0.063 | 10 1/4 | 32.200 | 82.520 | 105.060 |
| 1/2 | 1.571 | 0.196 | 0.250 | 10 1/2 | 32.990 | 86.590 | 110.250 |
| 3/4 | 2.356 | 0.442 | 0.563 | 10 3/4 | 33.770 | 90.760 | 115.560 |
| 1 | 3.142 | 0.785 | 1.000 | 11 | 34.560 | 95.030 | 121.000 |
| 1 1/4 | 3.927 | 1.227 | 1.563 | 11 1/4 | 35.340 | 99.400 | 126.560 |
| 1 1/2 | 4.712 | 1.767 | 2.250 | 11 1/2 | 36.130 | 103.870 | 132.250 |
| 1 3/4 | 5.498 | 2.405 | 3.063 | 11 3/4 | 36.910 | 108.430 | 138.060 |
| 2 | 6.283 | 3.142 | 4.000 | 12 | 37.700 | 113.100 | 144.000 |
| 2 1/4 | 7.069 | 3.976 | 5.063 | 12 1/4 | 38.480 | 117.860 | 150.060 |
| 2 1/2 | 7.854 | 4.909 | 6.250 | 12 1/2 | 39.270 | 122.720 | 156.250 |
| 2 3/4 | 8.639 | 5.940 | 7.563 | 12 3/4 | 40.060 | 127.680 | 162.560 |
| 3 | 9.425 | 7.069 | 9.000 | 13 | 40.840 | 132.730 | 169.000 |
| 3 1/4 | 10.210 | 8.296 | 10.560 | 13 1/4 | 41.630 | 137.890 | 175.560 |
| 3 1/2 | 11.000 | 9.621 | 12.250 | 13 1/2 | 42.410 | 143.140 | 182.250 |
| 3 3/4 | 11.780 | 11.040 | 14.060 | 13 3/4 | 43.200 | 148.490 | 189.060 |
| 4 | 12.570 | 12.470 | 16.000 | 14 | 43.980 | 153.940 | 196.000 |
| 4 1/4 | 13.350 | 14.190 | 18.060 | 14 1/4 | 44.770 | 159.490 | 209.060 |
| 4 1/2 | 14.140 | 15.900 | 20.250 | 14 1/2 | 45.550 | 165.130 | 210.250 |
| 4 3/4 | 14.920 | 17.720 | 22.560 | 14 3/4 | 46.340 | 170.870 | 217.560 |
| 5 | 15.710 | 19.640 | 25.000 | 15 | 47.120 | 176.720 | 225.000 |
| 5 1/4 | 16.490 | 21.650 | 27.560 | 15 1/4 | 47.910 | 182.650 | 232.560 |
| 5 1/2 | 17.280 | 23.760 | 30.250 | 15 1/2 | 48.690 | 188.690 | 240.250 |
| 5 3/4 | 18.060 | 25.970 | 33.060 | 15 3/4 | 49.480 | 194.830 | 248.060 |
| 6 | 18.850 | 28.270 | 36.000 | 16 | 50.270 | 201.060 | 256.000 |
| 6 1/4 | 19.640 | 30.680 | 39.060 | 16 1/4 | 51.050 | 207.390 | 264.060 |
| 6 1/2 | 20.420 | 33.180 | 42.250 | 16 1/2 | 51.840 | 213.830 | 272.250 |
| 6 3/4 | 21.210 | 35.780 | 45.560 | 16 3/4 | 53.620 | 220.350 | 280.560 |
| 7 | 21.990 | 38.480 | 49.000 | 17 | 53.410 | 226.980 | 289.000 |
| 7 1/4 | 22.780 | 41.280 | 52.560 | 17 1/4 | 54.190 | 233.710 | 297.560 |
| 7 1/2 | 23.560 | 44.180 | 56.250 | 17 1/2 | 54.980 | 240.530 | 306.250 |
| 7 3/4 | 24.350 | 47.170 | 60.060 | 17 3/4 | 55.760 | 247.450 | 315.060 |
| 8 | 25.130 | 50.270 | 64.000 | 18 | 56.550 | 254.470 | 324.000 |
| 8 1/4 | 25.920 | 53.460 | 68.060 | 18 1/4 | 57.330 | 261.590 | 333.060 |
| 8 1/2 | 26.700 | 56.750 | 72.250 | 18 1/2 | 58.120 | 268.800 | 342.250 |
| 8 3/4 | 27.490 | 60.130 | 76.560 | 18 3/4 | 58.910 | 276.120 | 351.560 |
| 9 | 28.280 | 63.620 | 81.000 | 19 | 59.690 | 283.530 | 361.000 |
| 9 1/4 | 29.060 | 67.200 | 85.560 | 19 1/4 | 60.480 | 291.040 | 370.560 |
| 9 1/2 | 29.850 | 70.880 | 90.250 | 19 1/2 | 61.260 | 298.650 | 380.250 |
| 9 3/4 | 30.630 | 74.660 | 95.060 | 19 3/4 | 62.050 | 306.360 | 390.060 |
| 10 | 31.420 | 78.540 | 100.000 | 20 | 62.830 | 314.160 | 400.000 |
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Rules Relating come Circles and Ovals
The circumference of a circle is the diameter x 3.1416. The diameter the a one is the circumference multiply by 0.31831. The area that a one is the diameter x diameter x 0.7854. The area of an oval is the longest diameter x the shortest x 0.7854.See more: Here'S What Happens When You Knock The Wind Out Of Yourself
A circle is 0.7854 time as hefty as a square of the same size.