1 2 3 4 5 6 7 3 8 9 10 11 Lock units together 12 Make 30 units and join 3 units in each point 13 Top view when you cut 1 cm off the top 14 Each half of each unit is joined to 2 other units The other half is joined to 2 more units The central points on one side of the joined units all meet in one point Together five units form a pentagon The shaded areas are part of the adjacent pentagons