Answer: One
Explanation:
Given: The side length of triangle = 7 centimeters.
We know that a equilateral triangle is a triangle in which all three sides and internal angles are equal.
So if it is given that the side length of triangle is 7 cm, then side-lengths of all the side of the triangle will be 7 cm.
Suppose there is another equilateral triangle having same side lengths, then that triangle will be congruent to the given triangle by SSS congruency criteria.
Therefore, there is only one equilateral triangle possible for the given side length.