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an isoceles triangle has two equal sides and therefore has two angles that are congruent.
A triangle is called a scalene triangle if its sides have different length measures. Since in an isosceles triangle there are two congruent sides, it cannot be a scalene triangle.
At least 2. (If all 3 sides are congruent it's equallateral, but can still be called isoceles)
An isosceles triangle.
It has to have at least 2 congruent angles and/or sides to be isosceles. Therefore, an equilateral angle would be isosceles.