One of the angles of an isosceles triangle is 800. Find the other two angles
which are equal.

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.