平方值                π值
22 = 4                π=3.14
32 = 9                2π=6.28         6.28÷3.14= 2
42 = 16               3π=9.42         9.42÷3.14= 3
52 = 25               4π=12.56        12.56÷3.14= 4
62 =36               5π=15.7          15.7÷3.14= 5
72 = 49               6π=18.84        18.84÷3.14= 6
82 = 64               7π=21.98        21.98÷3.14= 7
92 = 81               8π=25.12        25.12÷3.14= 8
102 = 100             9π=28.26        28.26÷3.14= 9
152 = 225             12π=37.68       37.68÷3.14= 12
252 = 625             16π=50.24       50.24÷3.14= 16
202 = 400             25π=78.5        78.5÷3.14= 25
302 = 900             36π=113.04      113.04÷3.14= 36
602 = 3600

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