Stores the coordinates of the vertices of the triangles
triangle1 = rectangle [ 1 : ] NEW_LINE triangle2 = rectangle [ : 3 ] NEW_LINE triangle3 = rectangle [ : 2 ] NEW_LINE triangle3 . append ( rectangle [ 3 ] ) NEW_LINE triangle4 = rectangle [ - 2 : ] NEW_LINE triangle4 . append ( rectangle [ 0 ] ) NEW_LINE