In an isosceles triangle, the apex angle is 80 degrees. What are the other equal angles?

The sum of the angles of a triangle is 180 degrees, then the sum of the angles at the base is:

180 – 80 = 100о.

Since, by condition, the triangle is isosceles, the angles at the base have the same magnitude, which means:

100: 2 = 50o.




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