![]() The vertex angle of an obtuse isosceles triangle is always less than 90 degrees but greater than the base angles. ![]() An obtuse isosceles triangle is a triangle where one angle is obtuse, and the other two angles are acute.The vertex angle of an acute isosceles triangle is always greater than 45 degrees. An acute isosceles triangle is a triangle where all three angles are acute angles.The vertex angle of a right isosceles triangle is 90 degrees, and the base angles are each 45 degrees. ![]()
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