This is thnee kueh or what Penang Malays call Kueh Bakul. It was such a prized delicacies among my Malay neighbors, only the closest one receive one. It is because home-made thnee Kueh is labour intensive to make. The factory-made ones you buy nowadays are really inedible!
My mother found a perfect box to hold six pieces. The box measures 27 cm x 18 cm x 7.5 cm, 7.5 cm being the height. The thnee kueh fits exactly with 2 cm to spare on the top.
Estimate the volume of each thnee kueh.