You are watching TV until your brother's best friend walks in and turns off the TV. You yell at him "Hey!" Then he says "It's time for your math lesson" He is your math tutor your parents have hired but he's also your brother's best friend. You are up in your room and Bang Chan is teaching you about the radius and diameter. (Your parents are the richest people in the whole world) What do you do if you don't want to study but he's your brother's best friend and you don't want to disappoint him??