Internal Angle Bisectors

Geometry Level 3

Find the perimeter of the triangle which has internal angle bisector lengths of 7595 7595 , 4704 2 4704\sqrt{2} , and 14880 2 14880\sqrt{2} .


The answer is 48608.

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1 solution

David Vreken
Oct 5, 2019

For a triangle with sides a 1 a_1 , a 2 a_2 , and a 3 a_3 , an internal angle bisector t 1 t_1 has the equation t 1 2 = a 2 a 3 ( 1 a 1 2 ( a 2 + a 3 ) 2 ) t_1^2 = a_2a_3(1 - \frac{a_1^2}{(a_2 + a_3)^2}) . Solving the equations

( 7595 ) 2 = a 2 a 3 ( 1 a 1 2 ( a 2 + a 3 ) 2 ) (7595)^2 = a_2a_3(1 - \frac{a_1^2}{(a_2 + a_3)^2})

( 4704 2 ) 2 = a 1 a 3 ( 1 a 2 2 ( a 1 + a 3 ) 2 ) (4704\sqrt{2})^2 = a_1a_3(1 - \frac{a_2^2}{(a_1 + a_3)^2})

( 14880 2 ) 2 = a 1 a 2 ( 1 a 3 2 ( a 1 + a 2 ) 2 ) (14880\sqrt{2})^2 = a_1a_2(1 - \frac{a_3^2}{(a_1 + a_2)^2})

gives a 1 = 21700 a_1 = 21700 , a 2 = 20832 a_2 = 20832 , and a 3 = 6076 a_3 = 6076 , for a perimeter of 21700 + 20832 + 6076 = 48608 21700 + 20832 + 6076 = \boxed{48608} .

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