How many plants spaced every 6 in. are needed to surround a circular walkway within a 25 ft. radius?

Consider the following formula to find the circumference of circle

C = 2^_r

here r is radius of circle

the radius of circular is 25 ft.

Therefore circumference is as follows

C = 2^_r

= 2 * 3.14 (25)

= 157.

circumference of circle feet is 157 * 12 inches.