False
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right triangle
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A right triangle may be isosceles or scalene (though not at the same time), but never acute, since an acute triangle is defined as having all interior angles less than 90°. A right triangle by definition has one 90° angle.
No. A scalene triangle is never isosceles. An isosceles triangle has two equal sides. A scalene triangle has none.
An isosceles triangle can never be a scalene triangle but it can take the shape of a right angle triangle