The distance in the Y-direction to the centroid of a semicircular lamina of radius a with respect to the diameter chord kept along the X-axis is:

1
\(\frac{5 a}{3 \pi}\)
2
\(\frac{4 a}{3 \pi}\)
3
\(\frac{3 a}{4 \pi}\)
4
\(\frac{2 a}{3 \pi}\)

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