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I am unsure how to solve part B of question 11 from the ETS GRE math review--find the diagonal of AB for the rectangular solid. I am guessing Pythagorean theorem will come into play, but I'm confused how to set this one up...[ATTACH=CONFIG]6797[/ATTACH] Thanks in advance for any help or input provided!

The ETS Official Guide (3rd ed.) tells us how questions on the Reading Section on their test are scored when they have more than one answer required. Summary questions needing three answers are scored as follows according to both ETS (p.51) and Cambridge (p. xxiii): 3 correct choices = 2 pts. 2 correct choices = 1 1 correct choice = 0 0 correct choices = 0 Table Completion questions needing five answers are scored as follows according to ETS (p.55): 5 correct choices = 3 pts. 4 correct choices = 2 3 correct choices = 1 2 correct choices = 0 1 correct choice = 0 0 correct choices = 0 However, Cambridge (p.xxiii) fails to tell us that some table Completion questions need five answers! Table Completion questions needing seven answers are scored as follows according to ETS (p.55): 7 correct choices = 4 pts. 6 correct choices = 3 5 correct choices = 2 4 correct choices = 1 3 correct choices = 0 2 correct choices = 0 1 correct choice = 0 0 correct choices = 0 However, Cambridge (p.xxiii) generously scores the same question as follows: 7 correct choices = 4 pts. 6 correct choices = 3 5 correct choices = 2 4 correct choices = 2 3 correct choices = 1 2 correct choices = 1 1 correct choice = 0 0 correct choices = 0 Remember, ETS is the company that administers and scores the TOEFL, not Cambridge.