A scalene triangle is one that has three lengths of different sizes. It is quite possible for a right triangle to have three sides of different length.
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False
Absolutely false. A scalene triangle by definition has no side equal to another. An isosceles triangle by definition has two equal sides.
An equiangular triangle is always equal. A scalene triangle does not have to have any equal sides. Therefore an equiangular triangle in never scalene.
false
False - and false ! Not ALL angles are right-angles - and a triangle has THREE sides !