The McGraw Hill 6th grade book series of games.
Instructions:
Find three coins of different sizes (e.g. quarter, nickle, penny). Flip each and record the head/tail value. Look up the angle degree from Door A . Flip the three coins and do a look up in the angle degree from Door B . Add them and decide whether you have an acute, right, or obtuse angle . Your opponent may challenge you. Look up the answer in the table on the next page. If you are right and your opponent didn't challenge you, you get a point. If you are right and your opponent did challenge you, you get two points. If you are wrong and your opponent challenged you, your opponent gets a point. If you are wrong and your opponent didn't challenge you, nobody gets a point. Your opponent plays next. 
 vals[0] 
 Angle 


 Coin tosses (largest to smallest):  TTT TTH THT THH HTT HTH HHT HHH


 Angle (degrees) of Door A 50 32 42 78 80 66 38 58


 Angle (degrees) of Door B 22 28 32 40 48 56 68 70

 
  On a different page so the players have to turn to it...