All right-angled triangles are scalene with the sole exception of the 90-45-45 shape.
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Any triangle can have a maximum of one right angle. Most right triangles are scalene triangles. The only non-scalene right triangle is a 45° - 45° - 90° isosceles right triangle. It is not possible to have an equilateral right triangle in plane geometry. A scalene triangle does not have to have a right angle, but it can have one.
If you meant scalene triangle, then it may have a right angle. By definition, a scalene triangle is a triangle with no angle or side measures that are the same. For example, a 30,60,90 triangle is scalene.
A right angle triangle can be scalene. Such a triangle has one right angle, two other unequal angles and no equal sides
A scalene triangle has no equal sides and no right angle.
Having three unequal sides of a triangle is called scalene an angle can be acute angle (<900), right angle (900) and obtuse angle(>900)