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When an angle of the scalene triangle is less than 90 but the other two are always more.
No, but a isosceles triangle can be a right angle triangle if it has a 90 degrees angle and two 45 degrees angles.
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.
I'm assuming you mean a scalene triangle? It has two angles which together add up to <90 degrees, and one other angle to make the total up to 180 degrees Basically an obtuse (or scalene) triangle just has an obtuse angle (>90 degrees)