Question

A landscape gardener wishes to spread fertilizer on a semicircular garden bed which has a diameter of 4.7m. How much fertilizer is required, if the fertilizer is applied at the rate of 20g per square metre.

Answer 1

circle area = \[pi*r^2\]
semicircle area = \[0.5*pi*r^2\]
d=4.7m
r=0.5*d = 2.35m

semicircle area = \[0.5*pi*(2.35m)^2 = 8.674m^2\]
\[(8.674m^2)(20g/m^2) = 173.48g\]

Answer 2

thanks!!!