In the Illustration You Ll Notice That the Diameter of a Metal

Multiple Choice

In the illustration you ll notice that the diameter of a metal washer is a = 7 centimeters. The diameter of the hole is b = 2 centimeters. How many square centimeters of metal are there in 28 washers? Express the answer in terms of $\pi$ .

A) $335 \pi \mathrm { cm } ^ { 2 }$
B) $305 \pi \mathrm { cm } ^ { 2 }$
C) $315 \pi \mathrm { cm } ^ { 2 }$
D) $325 \pi \mathrm { cm } ^ { 2 }$
E) none of these