等腰(等边)三角形计算器
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)) |