Randy is designing a circular garden that is 18 feet in diameter. He is buying plastic edging that costs $1.50 per foot. He can only buy edging in whole-foot amounts. How much does it cost Randy to buy edging for his garden? Use 3.14 for pie.

First we need to figure out the circumference of the gardening area. The circumference fell is the length around the circle. We can use the circumference formula:

2*pi*r or pi*d

Where r = radius and d=diameter

If you plug in the diameter of 18 ft you get:

18 * pi

= 56.55 ft

Since he can only buy whole foot amounts, we will round up to 57 ft, not down, because he can have a little extra, but can't be under the amount he needs.

Now if it cost $1.50 for every foot, we just multiply that by our footing

1.5 * 57 = $85.50