直角三角形（勾股定理）计算器
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| 勾股定理 | c2 = a2 + b2 |
| 面积 | a × b / 2 |
| c边的高 (h) | a × b / c |
| a边角平分线 | 2 × b × c × Cos(A/2) / (b + c) |
| b边角平分线 | 2 × a × c × Cos(B/2) / (a + c) |
| c边角平分线 (tc) | tc2 = 2 × a2 × b2 / (a + b)2 |
| a边中位线 ( ma ) | ma2 = b2 + 0.25 × a2 |
| b边中位线 ( mb ) | mb2 = a2 + 0.25 × b2 |
| c 边中位线( mc ) | mc = c / 2 |
| 内切圆半径 | a × b / ( a + b + c ) |
| 外接圆半径 | c / 2 |