Yes. In this case, the isosceles triangle would more specifically be an equilateral triangle - this can be considered a special case of an isosceles triangle.
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If you mean an equilateral triangle then the 3rd angle is 60 degrees
The supplement to that angle is 60 degrees.
The last angle would have to be 60 degrees as well. Since there are 180 degrees in a triangle, 60+60=120 and 180-120=60, it has to be 60 degrees.
It is an acute angle.
An angle of 60 degrees is an acute angle because it is greater than 0 but less than 90 degrees.