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The area of a circle is \(A_\text{c} = (\pi/4) d^2\).
\begin{equation*}
\alpha _t(i) = P(O_1, O_2, \ldots O_t, q_t = S_i \lambda )
\int_\Omega d \omega = \partial X
\end{equation*}
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The area of a circle is \(A_\text{c} = (\pi/4) d^2\).