Let the two same angles in triangle be x.
Now, As we know the sum of internal angles of a triangle is 180. so,
800+x+x=180
2x=180-800
2x=-620
x= -310
Hence both other angles are -310 degree each.
Hope it helps you ☺️
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Btw just informing you that one of the angles of an isosceles triangle can not be 800, it is not possible.
