Calculate the degree measures of the angles of an isosceles triangle if one of its angles at the base is 55.

As we know from the taught school curriculum, the angles at the base of this type of triangles will be the same.
And since, according to the specification, one of the angles at the base is 55 °, then the other angle at the base will also be 55 °.
Let us determine what the angle of the triangle, which is opposite to its base, will equal, when we know from the geometry course that the sum of the angles in the figure is 180 °:
180 – 55 – 55 = 70.
Answer: Under such conditions, it will have two angles at 55 ° and one at 70 °.