In an isosceles triangle, the base angle is 30, what is the apex angle?

The sum of all the angles of the triangle is 180 degrees. Since the angles at the base of an isosceles triangle are equal, therefore, their sum will be 30 + 30 = 60 degrees. From this we conclude that the angle at the vertex is 180-60 = 120 degrees.
Answer: 120 degrees.




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