Find the volume of a cube whose total surface area is 486cm².

6 The parallel sides of a trapezium are 25cm and 13cm. Its nonparallel sides are equal each being 10cm. Find the area of the trapezium. 7 Find the volume, the total surface area and the lateral surface of a cuboid which is 8m long, 6m broad and 3.5m high. 9 How many bricks will be required for a wall which is 8m long 6m high and 22.5cm thick if each brick measures 25cm × 11.25 cm × 6cm?  10 An open rectangular cistern when measured outside is 1.35 m long 1.08m broad and 90cm deep and is made of iron which is 2.5cm thick. Find the capacity of the cistern and the volume of the iron used.