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No, they are definitely not. An isosceles triangle is a triangle with 2 sides that have the same length. An equilateral triangle is a triangle with 3, or all sides with the same length.
An isosceles triangle has 2 sides the same length, and two angles the same. The other side has a different length. (If all three are the same, it is an equilateral triangle.)
An isosceles triangle is a triangle with two sides of equal length.
An isosceles triangle has 3 sides 2 of which are equal in length An isosceles triangle has 3 interior angles 2 of which are the same size
An isosceles triangle is a triangle with 2 congruent sides. (2 sides are the same length)