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.

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A circle is 0.7854 time as hefty as a square of the same size.