Calculate the second moments of area about an axis through the centroid for (a) a square section of side 250 mm, (b) a rectangular section 100 mm deep and 75 mm wide, (c) a circular section 50 mm...

Calculate the second moments of area about an axis through the centroid for (a) a square section of side 250 mm, (b) a rectangular section 100 mm deep and 75 mm wide, (c) a circular section 50 mm diameter, (d) a tube section of internal diameter 50 mm and external diameter 75 mm, (e) a square hollow section of internal side 220 mm and external side 250 mm.