Emily needs to buy mulch to cover her 10 meter wide circular garden planted in a square shaped yard. what is the area of the yard that will not be covered with mulch, in square meters? use 3.14 as pi

We know that
area of a circle=pi*r²
diameter=10 m
radius r=10/2> 5 m
area of a circle=pi*5²> 78.5 m²> area of the circular garden

area of a square=b²
where b is the length side of the square
b=10 m
area of a square=10²> 100 m²> area of the square shaped yard
so
the area of the yard that will not be covered with mulch=100-78.5
the area of the yard that will not be covered with mulch=21.5 m²

the answer is
21.5 m²