There could be almost any acute angle. it maters what kind it is
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A triangle that has one right angle and is isosceles is called an isosceles right triangle.
An isosceles triangle can have a 90 degree angle, but doesn't necessarily. Similarly, a right triangle can be an isosceles triangle, but isn't necessarily.
No.
An isosceles obtuse triangle is a triangle with 1 obtuse angle and only 2 congruent sides.
A triangle with two congruent sides is isosceles. A triangle with an angle of 104 degrees is obtuse. So you would have an obtuse isosceles triangle.