The diameter would have to be 0.17 inches. Not much change in diameter from before. Explore the effect of other assumptions and parameters. Ask the students to summarize their major learnings, and to think of similar situations where their learnings apply. The intergroup goal is for triads to check each other's work and provide any suggestions and assistance other triads need to obtain a better answer.
Partners check each other's work.
Another triad checks each triad's work. Teacher randomly selects individual members of the groups to present. Each member of group can explain answer and method. Whenever it is helpful, check procedures, answers, and strategies with other groups. Monitor to catch misunderstanding in the early stages and to help establish the rules.