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9² = 81
czyli...
51,87 + x² = 81
9² - 7² = 32
x * x = 32 ; 4 * 8 = 32
7,2² + 32 = 9²
51,84 +x²=81
x² = 81 - 51,84
x² = 29,16
x = √29,16
x = 5,4