Answer:
Part 1) Area of rectangle 
Part 2) Area of semicircle 
Par 3) Total area of grass 
Step-by-step explanation:
we know that
The total area of grass is equal to the area of rectangle minus the area of semicircle
step 1
Find the area of rectangle
The area of rectangle is equal to

step 2
Find the area of semicircle
The area of semicircle is equal to

we have
-----> the radius is half the diameter
substitute


step 3
Find the total area of grass
