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In the figure PQRS is a square of side l cm. Points X and Y are on SR and SP respectively such that SX = 1/3SR and SY= 2/3SP.
Show that the area of the shaded region is 7/18 l^2cm^2.
b) Given that the area of the shaded region is 56 cm^2, find the value of l and hence calculate the area of triangle SXY.