First, make a triangle of coins using V pieces.
The big thing to remember here is to have the V pieces always curving in on the shape, like a ball.
Next, choose one of the coins and build around that until you have the 'middle' coin with a pentagon (5 coins) around it.
(this is the same shape you have right now, from a different angle)
The shape you end up with from the above step is very similar to the hexagon using I pieces, accept there's 5 coins around the middle coin and you're using V pieces instead of I pieces.
Next, on top of the 5 outer coins, add another layer of coins.
This will also take 5 coins.
When you've done that, the 'ball' shape will be easy to see.
Next, add the final coin to the top, completeing the ball.
You did it!
This is the hardest shape to make from this web site, mainly because all of the other shapes are flat.
They don't bend up off the surface of the table.
For most people this is the hardest shape to visualize.
About the mathematics of this shape.
This is not a correct shape.
What does that mean?
In the triangle shape (the one made with I pieces), for instance, the thing you make with Coinstruction has angles that add up to 180 degrees, just like a triangle drawn on a (flat) piece of paper.
The angles in the ball shape here do not add up properly.
The reason it's possible to make this shape with Coinstruction is the plastic pieces bend a tiny bit, just enough of a 'fudge factor' to make it (the ball) work.