PROOVE THAT THE SUM OF ANGLES OF TRINGLE IS 180
Refer the solution of part (1) in the given link :
https://www.meritnation.com/ask-answer/question/i-want-all-the-solution-of-these-theorems-aas-soon-as-possib/lines-and-angles/1166053
https://www.meritnation.com/ask-answer/question/i-want-all-the-solution-of-these-theorems-aas-soon-as-possib/lines-and-angles/1166053