Find the perimeter of the triangle which has internal angle bisector lengths of , , and .
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For a triangle with sides a 1 , a 2 , and a 3 , an internal angle bisector t 1 has the equation t 1 2 = a 2 a 3 ( 1 − ( a 2 + a 3 ) 2 a 1 2 ) . Solving the equations
( 7 5 9 5 ) 2 = a 2 a 3 ( 1 − ( a 2 + a 3 ) 2 a 1 2 )
( 4 7 0 4 2 ) 2 = a 1 a 3 ( 1 − ( a 1 + a 3 ) 2 a 2 2 )
( 1 4 8 8 0 2 ) 2 = a 1 a 2 ( 1 − ( a 1 + a 2 ) 2 a 3 2 )
gives a 1 = 2 1 7 0 0 , a 2 = 2 0 8 3 2 , and a 3 = 6 0 7 6 , for a perimeter of 2 1 7 0 0 + 2 0 8 3 2 + 6 0 7 6 = 4 8 6 0 8 .