एक समान (uniform) और सममित पटल (lamina) का गुरुत्व केंद्र कहाँ स्थित होता है?

What is the distance of the centre of gravity of a semicircular plate of 1.32 m diameter from its base along the Y-axis?

The center of gravity of a trapezium with parallel sides A and B (where side B is at the base) and height H, measured from the base B, is at a distance of: