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No, scalene triangles can be obtuse, right or acute triangles.

A 3 - 4 -5 right triangle (lengths of the sides) is one example of a right-scalene triangle. In fact, with the exception of the [45°, 45°, 90°] right triangle (which is isosceles) all other right triangles are scalene.

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Q: Are all scalene triangles acute triangles?
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