Dimensions of rectangular solid l = 42 cm, b = 30 cm and h = 20 cm

Conical cavity’s diameter = 14 cm

its radius = 7 cm

Depth (height) = 24 cm

(i) Total surface area of cuboid

Diameter of the cone = 14 cm

its radius = 14/2 = 7 cm

Area of circular base

(ii) Volume of the rectangular solid = (42 x 30 x 20) cm^{3} = 25200 cm^{3}

Radius of conical cavity (r) = 7 cm

Height (h) = 24 cm