Since the garden is circular, you will have to find the area of a circle. The formula is:
[tex] \pi \times r^{2} [/tex]
The diameter is 16 feet. Radius is ½ of the diameter. To find the radius, divide the diameter by 2.
[tex] d = 16 \\ 16 \div 2 = 8 \\ \\ r = 8 [/tex]
Square the radius
[tex] r = 8 \\ 8^{2} = 8 \times 8 = 64 [/tex]
Multiply by π(3.14)
[tex] 64 \times 3.14 = 200.96 [/tex]
The area of the garden is 200.96 feet
A diameter is twice as much as a radius. So in this case you divide the diameter by 2 which then becomes 8. Then the formula of a circle is 2(pi)(R) = approximately 50.27 ft