No. The only time they have to be the same length is in an equilateral triangle.
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If all of its sides are the same length its an equilateral triangle. If only two of its sides are the same length it is an isosceles triangle. If all the sides are different lengths it is a scalene triangle
equilateral triangle- all sides the same length isosceles triangle- 2 sides the same length scalene triangle- no sides the same length
All triangles have three sides. An isosceles triangle has two sides which are the same length and an equilateral triangle has all three sides of the same length.
An equilateral triangle is a triangle with all sides the same length.
An EQUILATERAL triangle has all three sides the same length. An ISOSCELES triangle has two sides with the same length. A SCALENE triangle has all three sides different lengths.