Robertsion Construction ( a building company that is building our new school) came in today and they set our class a challenge. Our a challange was to make a 4 m high tetrahedron. we started by making our own mini ones and we had to make 64 small ones also we used 384 pieces of dowling. Then we took four small tetrahedrons and made a bigger one and lastly we made out of the four big ones together and ten we added them all together which was really hard and we needed the 3 tallest people in the class toput the top one on then it was complete. It was really fun and the rest of the school came in to see it.