The sides of a triangle add up to the perimeter.
An equilateral triangle
An equilateral triangle has three equal sides. The angles of an equilateral triangle measure 60 degrees each, but the sides can be any length.
with a ruler
Use a ruler.
it is an issosolesse triangle
An equilateral triangle.
is the perimeter of the triangle whose sides measure 7.5 7.1 and 8.1
No, but if associated with some measurement units, it can be the measure of one side of a triangle.