PLEASE HELP DUE IN 30 MINS

80. This is very simple, and your in highschool as it seems. You need to practice more and learn. A isosceles triangle means that one of its interior angles are different, but the other two interior angles are the same. I hope I helped you, but next time try to figure things out for yourself. Maybe try researching these things if you dont understand their concepts, meanings, functions, etc...