The centroid of a quarter circle is located at a distance of \( \frac{4r}{3\pi} \) from the center of the circle along both axes. Given the radius \( r = 0.8 \) m (since 80 cm = 0.8 m), the depth of the centroid below the water surface is:
\[ h_c = 8 \, \text{m} +
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