I don't understand

Question

Ray B is the Perpendicular Bisector of AC. Triangle ABC has a perimeter of 41.82. What is the measure of AB?

Answer 1

In this case you now have 2=right triangles from an isosceles triangle.

So the 3 sides are =. 41.82/3=13.94=AB.

Answer 2

Visually, the triangle appears to be equilateral or very close to it. That means 3 sides are all equal and = 1/3 of the perimeter = 41.82/3 = 13.94

But if the triangle is not drawn to scale, all we can be certain of is that 2 sides are equal and each of those two sides, such as AB is between 1/4 and 1/2 of 41.82

10.455 < AB < 20.91