Answer: Area of Yellow part is 5.365046 
Step-by-step explanation:
Figure show that length of square is 5 ft and diameter of circle is also, 5 ft.
Here, Red part + Yellow part = Entire square of length of 5ft
Area of red part is area of circle = 
= 
= 19.634954 
Area of Entire square of length of 5ft = 5x5 = 25 
Therefore, Area of Yellow part is 25-19.634954=5.365046 