Question 884610
Your description may be like this:


Length of rectangle may be 18 yard diameter of the semicircle.  The width would be of the rectangle, 9 yards same as the radius of the semicircle.  


Area of the semicircle:  {{{(1/2)pi*9^2=81pi/2}}}.

Total area of the rectangle:  {{{18*9=162}}}.

Area in rectangle NOT in the semicircle:  {{{highlight(162-81pi/2)}}} or equivalent in form or value.