Problem

Source: I All-Ukrainian Tournament of Young Mathematicians, Qualifying p17

Tags: geometry, 3D geometry, cone, right triangle, Ukrainian TYM



A right triangle when rotating around a large leg forms a cone with a volume of $100\pi$. Calculate the length of the path that passes through each vertex of the triangle at rotation of $180^o$ around the point of intersection of its bisectors, if the sum of the diameters of the circles, inscribed in the triangle and circumscribed around it, are equal to $17$.