We have no way to know that, from the information given in the question.
All we know, if the triangle is isosceles, is that two of the angles are equal,
and that all three angles sum to 180 degrees.
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90° 45° 45°
51 degees
(180-112)/2=34
Its 2 equal base angles will each measure 65 degrees
Yes normally, unless it is a right angle isosceles triangle which will have angles of 90, 45 and 45 degrees.