Respuesta :

Answer:

5, 5, 5

Step-by-step explanation:

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The set of side length that represents a triangle with 3 lines of reflectional symmetry is 5,5,5

Reflectional symmetry is a line that divides a triangle into halves. The halves the triangle are divided into are a reflection of each other.

A triangle is a shape that has three sides with three angles which sum up to 180 degrees.

Types of triangles :

  1. Equilateral triangle : the three sides of the triangle have an equal length. It has three lines of reflectional symmetry  
  2. Right-angled triangle :  the square of the longest side is equal to the sum of the square of the other two sides
  3. Scalene triangle : all the three sides of the triangle have different lengths. It has no line of reflectional symmetry.
  4. Isosceles triangle ; it has two sides that have an equal length. It has one line of reflectional symmetry  

To learn more about reflectional symmetry, please check: https://brainly.com/question/1593820?referrer=searchResults

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