Any kind of triangle can have rational or irrational sides: acute angled, right angled or obtuse angled; equilateral, isosceles or scalene.
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A triangle can have only three sides. No triangle can have 9 sides!
The triangle that has sides of different length is called a scalene triangle.
it is a scalene triangle.
An equilateral triangle has 3 sides of the same lengths.
It is an equilateral triangle that has 3 congruent sides