You can arrange four rectangles such that they form an approximation of an isosceles triangle. The bottom rectangle represents the base of the triangle, with a width of 22.4 cm and a height of 5.6 cm. Just above that is another rectangle with a width of 16.8 cm and a height of 5.6 cm, followed by a rectangle with a width of 11.2 cm and a height of 5.6 cm. The top of the triangle is a square that is 5.6 cm in width and height. Arranged this way, the set of rectangles looks approximately like a triangle of base 22.4 cm and height 22.4 cm. If the bottom left corner is the origin, what are the coordinates of the centre of mass? Enter the x-value first, followed by the y-value, in units of centimetres.