To find the perimeter of a triangle, we need to add the lengths of all its three sides.
The given lengths of the sides of the triangle are:
- Side 1: 5.5 cm
- Side 2: 6 cm
- Side 3: 6.5 cm
Let's start by adding side 1 and side 2:
5.5 cm (side 1) + 6 cm (side 2) = 11.5 cm
Next, add the result to side 3:
11.5 cm (from previous calculation) + 6.5 cm (side 3) = 18 cm
So, the total length, or the perimeter, of the triangle is 18 cm.