## Elementary Geometry for College Students (6th Edition)

$\approx$ 14.43 in.
The radius of each gear = 4 in The length of the chain = 2 * center distance + 2 * $\frac{circumference of the gear}{2}$ 54 in= 2 * center distance+ 2 * $\frac{2\pi r}{2}$ 54 = 2 * center distance+ 2$\pi$* 4 54 - 8$\pi$ = 2* center distance center distnce = 27 - 4$\pi$ center distance $\approx$ 14.43 in.