：1：3.14 2：6.28 3：9.42 4:12.56 5:15.7 6:18.84 7:21.56 8:25.12 9:28.26 10：31.4 11：34.54 12：37.68 13：1π = 3.14 2π = 6.28 3π = 9.42 4π = 12.56 5π = 15.7 6π = 18.84 7π = 21.98 8π = 25.12 9π = 28.26 10π =31.4 11π =34.54 12π =37.68 13π =40.82 14π =43.96 15π =47.1 16π =50.24 17π =53.38 18π =56.52 19π =59.66 20π =62.8 21π =65.94 22π =69.08 23π =72.22 24π =75.36 25π =78.5 26π =81.64 27π =84.78 28π =87.92 29π =91.06 30π =94.2 31π =97.34 32π =100.48 33π =103.62 34π =106.76 35π =109.9 36π =113.04 37π =116.18 38π =119.32 39π =122.46 40π =125.6 41π =128.74 42π =131.88 43π =135.02 44π =138.16 45π =141.3 46π =144.44 47π =147.58 48π =150.72 49π =153.86 50π =157 51....

：1：3.14 2：6.28 3：9.42 4:12.56 5:15.7 6:18.84 7:21.56 8:25.12 9:28.26 10：31.4 11：34.54 12：37.68 13：1π = 3.14 2π = 6.28 3π = 9.42 4π = 12.56 5π = 15.7 6π = 18.84 7π = 21.98 8π = 25.12 9π = 28.26 10π =31.4 11π =34.54 12π =37.68 13π =40.82 14π =43.96 15π =47.1 16π =50.24 17π =53.38 18π =56.52 19π =59.66 20π =62.8 21π =65.94 22π =69.08 23π =72.22 24π =75.36 25π =78.5 26π =81.64 27π =84.78 28π =87.92 29π =91.06 30π =94.2 31π =97.34 32π =100.48 33π =103.62 34π =106.76 35π =109.9 36π =113.04 37π =116.18 38π =119.32 39π =122.46 40π =125.6 41π =128.74 42π =131.88 43π =135.02 44π =138.16 45π =141.3 46π =144.44 47π =147.58 48π =150.72 49π =153.86 50π =157 51....