Pythagorean Theorem?!?!!?

an easy way to do this would to plug each one of these answer in. so since you know that A squared plus B squared = C squared. so start of with 12.75:12.75 squared plus 11 squared= 17(hopfully) (work it out)+ 12 squared plus 11 squared will give you 283.56 now find the square root of this and it will give you 16.83. okay so that didnt quite give us 17 so lets try 12.96 when you work this one out you get 288.96 and you square that and get 16.99, round to the nearest tenth adn you get 17:) goodluck:)