The graph of each function below is constructed from a quarter circle and two line segments. Using geometry, compute the following integrals.
\( \int _0^6 f(x) \d x =\int _0^2 f(x) \d x +\int _2^4 f(x) \d x +\int _4^6 f(x) \d x = \)
=Area(1/4 of a circle)+Area(triangle)+Area (square)
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