You have a quarter of a circle so its area is (pr^2)/4 and you have 3 5by5 squares (or one 5by5 and one 5by10 if you prefer) The radius of the quarter circle is 5 units. So the total area is:
A=25p+3(25)
A=25(p+3) u^2 (exactly)
A=163.54 u^2 (approximately to nearest one-hundredth)