Hello this question is for Mark. But if anyone know can help me too.

It's about game development / math and SO5 slopes.
As everyone know SO5 is a side scrolling game, i want to know a simply way (math way) to put two rectangles side by side one without 0 degrees and other with 3 degrees like SO5 slopes . I know how to place two side by side without angle but when it comes to angle it's the problem.
I want to put the next rectangle bottom left point at the same coordinates as previous bottom right point

Picture example
I can do this


I want to do this