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数学

勾股定理

勾股定理 — a² + b² = c²

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变量说明

a= leg (short side)b= leg (other short side)c= hypotenuse (longest side, opposite 90°)

Find hypotenuse c

Given both legs a and b.

Find leg a or b

Given the hypotenuse and one leg.

Find a
Find b

Pythagorean triples

Integer right triangles (whole number sides).

3-4-5
5-12-13
8-15-17

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专业提示

When two sides have a ratio close to 3:4, check if the third side is 5× the GCD. This instantly confirms a 3-4-5 family triple.

难度:中级

你知道吗?

There are over 370 known proofs of the Pythagorean theorem — more than any other theorem in mathematics. One was written by US President James Garfield in 1876.

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