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Because the mesh starts with two triangles and each is split recursively into two smaller triangles , a binary tree is often used to store the ROAM mesh in memory . For the momo soup we all made our versions , pieces of dough cut in triangles and rolled around a dollop of spinach and onion , steamed and added to a ginger broth . The diamond structure should contain pointers to its triangles and members dealing with its merge priority . Spread with ( 2 tbsp ) melted butter and cut into 18 long triangles and roll from the end opposite the tip , shaping to form a crescent . I recall that on the last few pages , the book discussed how far you could see ( i.e ., distance to the horizon ) from a spaceship 50,000 feet above the earth ( using similar triangles and the pythagorean theorem ) .