Find the midpoint of modifying above ab. (4.5, 4.5) (1.5, 1.5) (3, 3) (2, 2)

AB is a segment defines by the two points A and B.

Say the coordinates of the point A are (a1, a2) and the coordinates of point B are (b1,b2).

The midpoint is found using this.

x = (a1+b1)/2 and y = (a2+b2)/2

So, the coordinates of the midpoint are (a1+b1)/2 , (a2,b2)/2.

With that you can solve your question known the coordinates of points A and B.

Because you'd mostly have coins made around the 1900's or earlier