# Properties of Triangles – ExCircle

Properties of Triangles – ExCircle If r is radius of in circle and r₁, r₂, r₃ are the radii of ex-circle opposite to the vertices A, B, C of ΔABC respectively then (i) . . . . (ii) . . . . (iii) . . . . Example: Show that ∑a cos A = 2 Read more about Properties of Triangles – ExCircle[…]