Answer
$r_{75y.}\approx 46.17$y.
$r_{100y.}\approx 38.22$y.
$r_{125y.}\approx 30.26$y.
$r_{150y.}\approx 22.3$y.
Work Step by Step
From part (a), we have
$r=\dfrac{(P-2x)}{2 \pi}$
Plug $440 y.$ for $P$ and $75 y$ for $x$ in the above equation.
Thus, we have
$r_{75y.}=\dfrac{440-(2)(75)}{2 (3.14)}\approx 46.17$y.
Likewise, in the same manner, we have
$r_{100y.}=\dfrac{440-(2)(100)}{2 (3.14)}\approx 38.22$y.
$r_{125y.}=\dfrac{440-(2)(125)}{2 (3.14)}\approx 30.26$y.
$r_{150y.}=\dfrac{440-(2)(150)}{2 (3.14)}\approx 22.3$y.
