Heron's Formula for finding the area of a triangle

Herons Formula is a method for calculating the area of a triangle when you know the lengths of all three sides. Let a,b,c be the lengths of the sides of a triangle. Using Heron's formula this is the calculation to find the triangles area. Area= √(p(p-a)(p-b)(p-c) where p is half the perimeter: p= (a+b+c)/2 When you drag the blue dots to reshape the triangle, the formula shown will re-calculate the triangle's area using Heron's Formula.
Do you see a correlation with the sides of the triangle and the calculated area? Explain