no, it has one right angle. it would be a square with a side missing if it had 3 right sides.
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Yes. A right triangle is a triangle where one angle is a right angle. If two out of three angles are right angles, then it's an isosceles triangle. If all three angles are right angles, then it is an equilateral triangle.
Three.
No, an equilateral triangle as three 60 degree angles.
The most right angles a triangle can possibly have is 1. Any more than that, and it has to be a quadrilateral.
All three interior angles of a spherical triangle may be right angles.