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Answer :

Given the triangle shown in the picture, you can identify that:

- It has three congruent angles (they have the same measure):

[tex]60\text{\degree}[/tex]

- Its three sides have the same length:

[tex]5.7\text{ }units[/tex]

In order to solve this exercise you need to remember that, by definition:

- A Isosceles Triangle has two sides that have the same length and two congruent angles.

- An Equilateral Triangle is a triangle whose sides have all the same lengths and its interior angles have the same measure.

- A Right Triangle has an angle that measures 90 degrees.

- A Scalene Triangle has three sides of different lengths.

- An Acute Triangle whose angles measure less than 90 degrees.

Therefore, you can conclude that the given triangle is an Equilateral Triangle.

Hence, the answer is: Second option.