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Pizza Slice Area Difference

A $ 12^{\prime \prime} $-diameter pizza and a $ 16^{\prime \prime} $-diameter pizza are each cut into eight congruent slices. Jane ate three slices of the $ 12^{\prime \prime} $ pizza. Mark ate three slices of the $ 16^{\prime \prime} $ pizza. How many more square inches of pizza did Mark eat than Jane? Express your answer as a common fraction in terms of $ \pi $.

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$\frac{a}{b}$
.
0
=
%

$a^n$
$a^{\circ}$
$a_n$
$\sqrt{}$
$\sqrt[n]{}$
$\pi$
$\ln{}$
$\log$
$\theta$
$\sin{}$
$\cos{}$
$\tan{}$

$($
$)$
$[$
$]$
$\cap$
$\cup$
$,$
$\infty$

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