History of Hindu Mathematics: A Source Book v2.c17.s19.27

v2.c17.s19.27

If m² ± n² > p² ± q², the sides of the pair of isosceles trapeziums equal in area and altitude will be $a &= (m² - n²) - (p² - q²), / b &= (m² - n²) + (p² - q²), / c &= p² + q²; / a' &= (m² - n²) - (4m²n²/r - r)/2, / b' &= (m² - n²) + (4m²n²/r - r)/2, / c' &= (4m²n²/r + r)/2.$