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

September 15, 2021 | education

| 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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