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Question Number 177767 by mnjuly1970 last updated on 08/Oct/22

i n A \overset{Δ}{B C} p r o v e t h a t :

r_{a} + r_{b} + r_{c} = r + 4 R

r_{a} : e s c r i b e d c i r c l e r a d i u s

c o r r e s p o n d i n g t o A .

r : i n c i r l e r a d i u s

R : c i r c u m c i r c l e r a d i u s