A circular hollow steel (HSS) rod has a cross-sectional area of 723 mm and a wall thickness of 11 mm. Engineers fill the void of the steel rod with concrete and remove a sector from the rod. The removed sector has an angle of 50. Determine the cross-sectional area of only the concrete part of the removed sector piece in cm. thickness Concrete - Filled HSS (Cross-section view) 0.17 cm2 0.08 cm2 0.18 cm2 0.39 cm2 0.27 cm2