Suppose that the rational right triangle triple is (T1, T2, T3), their areas are Ai (i = 1, 2, 3), and perimeters are Pi (i = 1, 2, 3). By the theory of elliptic curves, we investigate the solvability of the following Diophantine system A1 + αA2 = βA3, P1 + αP2 = βP3, where α and β are rational numbers. When (α, β) = (−2, −1) or (α, β) = (1, 1), we show that there are infinitely many rational right triangle triples with the same perimeter and the areas in arithmetical progression or with the areas and perimeters satisfying the linea...