<p>Check your diagram.</p>
<p>Is there supposed to be a blue semicircle from a to b? If so, the answer is C, 6pi.</p>
<p>pi(3^2 - 2^2 +1^2).</p>
<p>If your diagram is correct, the answer is 5.5 * pi</p>
<p>pi(3^2 -2^2 + 1^2/2)</p>
<p>Check your diagram.</p>
<p>Is there supposed to be a blue semicircle from a to b? If so, the answer is C, 6pi.</p>
<p>pi(3^2 - 2^2 +1^2).</p>
<p>If your diagram is correct, the answer is 5.5 * pi</p>
<p>pi(3^2 -2^2 + 1^2/2)</p>