Hinh lap phuong tao boi 8 khuc go co canh 8:4 = 2 (cm)
Hinh lap phuong tao boi 27 khoi go co canh 27:9=3(cm)
Hinh lap phuong tao boi 8+27=35(cm)
( 7 hoac 5 khoi go khong doi xung nhau nen khong ghep duoc1 mat cua hinh lap phuong) do do khong the xep tat ca cac khoi go cua hai hinh lap phuong do thanh 1hinh lap phuong