geometry · worked example

Solve 兩股為 8 和 15 的直角三角形 — c = 17

Method: 畢氏定理. Verified step-by-step solution with our free AI math solver.
Problem

a2+b2=c2, a=8, b=15a^2 + b^2 = c^2,\ a=8,\ b=15

Step-by-step solution

  1. 確認兩股:a=8a = 8b=15b = 15

  2. 套用畢氏定理:a2+b2=c2a^2 + b^2 = c^2

  3. 代入:82+152=64+225=2898^2 + 15^2 = 64 + 225 = 289

  4. 取正平方根:c=289=17c = \sqrt{289} = 17

  5. (8,15,17)(8, 15, 17) 是另一組 本原畢氏三元數 — 互質且無法由縮放生成的三元數。

Answer

c=17c = 17

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