The minimum length possible is 18. The maximum is 38.
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An isosceles triangle is a triangle with two sides of equal length.
No sides of a scalene triangle are the same length.
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
An equilateral triangle is a triangle with all sides the same length.
You have to take the triangle inequality into account: no side can be longer than the two other sides together. That makes the minimum size for the third side 3 cm., and the maximum, 7 cm. To be more accurate, 3 cm < length < 7 cm.