A triangular lamina of area $A$ and height h is immersed in a liquid of density $\rho $ in a vertical plane with its base on the surface of the liquid. The thrust on the lamina is
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(b)Thrust on lamina = pressure at centroid $×$ Area
= $\frac{{h\rho g}}{3} \times A$=$\frac{1}{3}A\rho gh.$
= $\frac{{h\rho g}}{3} \times A$=$\frac{1}{3}A\rho gh.$
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