James plans to place flower pots along the perimeter of his rectangular garden. he measures the quantities shown to estimate the number of
cylindrical flower pots he should buy.
• length of the garden
• width of the garden
• spacing between the flower pots
which additional quantity would be most useful for james's estimation?
a height of the flower pots
b volume of the flower pots
c diameter of the flower pots
d surface area of the flower pots