Ok so lets 'draw' one by hand and then figure out how to get the computer to do what we did.

(I'm going to use '.' instead of ' ' so you can see them.)

Ok so in my head, I start with the base of the triange as that determines how big it will be:

Then I just add the lines above it:


Is that what you wanted?

So, for a 4 row triangle, the first row must be indented 3 spaces, the next 2 spaces, the next 1 space and the last line isn't indented at all.

The first line has 1 star, the second 2 stars seperated by a space, the third 3 stars with spaces and the last 4 stars with spaces.

Do you see a pattern here that you might be able to exploit?