AMC 10 2021-fall-b Problem 2

What is the area of the shaded figure shown below?

$\textbf{(A)}\: 4 \textbf{(B)} \: 6 \textbf{(C)} \: 8 \textbf{(D)} \: 10 \textbf{(E)} \: 12$

Dataset text NuminaMath-1.5. Quoted with source.

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