Question

The cost of the circular carpet, $C, varies as the square of the radius,
r metres. If C = 200 when r= 2
Find the cost of the circular carpet when r= 3

Answer 1

Answer:

$450

Step-by-step explanation:

C = k$r^{2}$

200 = k($2^{2}$) = 4k

k = 50

C = 50$r^{2}$ = 50($3^{2}$) = 50(9) = $450