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3 / a = 4 / b = 5 / C, find AB BC AC / a square + b square + C square
There is a skill to do this kind of problem. Do you think 3 / a = 4 / b = 5 / C really wants a = 3, B = 4, C = 5? But be more rigorous. Let a = 3T, then B = 4T, C = 5T. In this way, you can get the formula
(3T x 4T - 4T x 5T - 3T x 5T) / (.) it's hard to type computer, but it's still fast handwriting. I'll omit it. At last, I'll miss all the T's
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