A previous study shows how a twelve-year-old girl discovers angles in her narrative from a climbing trip. Based on this research, the girl's class takes part in one day of climbing and half a day of follow-up work at school. The students mathematise their climbing with respect to angles and they express themselves in texts and drawings. Their written and drawn expressions are categorised into three different levels: recognition, description and contextual tool. In addition, these expressions are interpreted to be narrative or analytical. All the narrative expressions were categorised as level one or below, while some of the analytical expressions were categorised as belonging to higher levels. The research findings point at how to use analytical drawings in work with analytical texts in geometry.