Idon't know how to explain the problem

Yes because an isosceles triangle is a triangle with two sides that are the same instead of three.

Isosceles sounds like EYE-sceles and we have two eyes.

So to explain say "The triangle in the graph is an isosceles triangle that has two sides that are equal in size"

A’b’c’ are the coordinates to the new location of the transformed triangle abc. find the distance between the coordinates points to use for your calculations.