面积(K), K 2 = b 2 * (4 × a 2 - b 2 ) / 16. 周长, 2 × a + b. 边b角平分线( tb ), tb 2 = 4 × a 2 - b 2 / 2. 边a角平分线( tb ), ta 2 = b 2 × a × (2a + b) / (a + b) 2.
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