Question 537403
surface area of water = 30*15 = 450 sq.ft

Surface area including side walk = (30+10)*(15+10)= 1000 sq.ft

So Area of sidewalk = 1000-450= 550 sq.ft

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Fencing  Area = pi * r^2

Radius = 30 ft.

Area = 3.14*30^2= 2826 sq.ft

Area of grassy region = 2826-1000 = 1826 sq.ft

Draw a sketch and the problem will be easy to solve