等腰（等边）三角形在线计算器
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| 面积(K) | K2 = b2 * (4 × a2 - b2) / 16 |
| 周长 | 2 × a + b |
| 边b角平分线 ( tb ) | tb2 = 4 × a2 - b2 / 2 |
| 边a角平分线( tb ) | ta2 = b2 × a × (2a + b) / (a + b)2 |
| 边a中位线 ( ma ) | ma2 = (2 * b2 + a2) / 4 |
| 边b中位线 ( mb ) | mb2 = (4 * a2 - b2) / 4 |
| 外接圆半径 | a / ( 2 * sin (A)) or b / ( 2 * sin (B)) |
| 内切圆半径 (r) | r2 = b2 × (2a - b) / (4 × (2a + b)) |