Question

A flower garden is shaped like a Its is 20 yd. A ring-shaped path goes around the garden. Its outer edge a circle with radius 26 yd . The gardener is going to cover the path with sandone bag of sand can cover 7 yd, how many bags of sand does the gardener need? Note that sand comes only by the bag, so the number of bags must be a whole number(Use the value 3.14 for )

Answer 1

radius of the flower garden is 20

radius of flower garden + path is 26

area of path

area of circle = 3.14 * radius^2

inside = 20^2 * 3.14

inside = 1256

outside = 26^2 * 3.14

outside = 2122.64

outside - inside = 2122.64 - 1256 = 866.64

the area of the path is 866.64, if a bag of sang covers 7 yds^2, 866.64 / 7 = 123.806

you cant buy a fraction of a bag, so round up

124 bags of sand