<u>Part a)</u> Find the area of the square
we know that
the area of the square is equal to

where
b is the length side of the square
In this problem

so

therefore
<u>the answer Part a) is </u>
The area of the square is 
<u>Part b)</u> Find the area of the circle
we know that
the area of the circle is equal to

where
r is the radius of the circle
in this problem
-----> divide diameter by 

therefore
<u>the answer Part b) is </u>
The area of the circle is 
<u>Part c)</u> Compare your answers from parts ( a ) and ( b ). Wich garden would give your sister the most space to plant?
we know that
Area of the square=
Area of the circle=
so

Area of circle > Area of square
therefore
<u>the answer part c) is </u>
The most space to plant is the garden with shape of a circle