AC = (AB2 power + BC2 power) 1 / 2 = 5, ab = 3 m, BC = 4 m How to calculate? Can you write the calculation process

AC = (AB ^ 2 + BC ^ 2) ^ 1 / 2 = (3 * 3 + 4 * 4) ^ 1 / 2 = 5 is to adopt the Pythagorean theorem
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