well, yes and no, on flat paper, that is impossible. The only way a triangle can have 3 90 degree angles is on a globe, but it is possible. The closest thing to an equilateral right triangle on flat paper is a 45 degree, 45 degree, 90 degree triangle, which would be an isosceles right triangle
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A right triangle can have 2 equal angles if they are each 45° (any other right triangle will have no equal angles)
An obtuse triangle can have no right angles, and has two equal angles.
A triangle has no right angles when it is not a right angle triangle as for example as in the case of an equilateral triangle that has 3 equal 60 degree angles.
a 'SCALENE' triangle. ; No equal sides, and no equal angles. An ISOSCELES triangle has two equal sides and two equal angles. An EQUILATERAL tringle has three equal sides and three equal angles all at 60 degrees. A RIGHT ANGLED triangle has one right angle (90 degrees) in it.
A triangle cannot have four angles.