A diary is 148 mm wide and 210 mm high. How do you find the diagonal of the diary?

Okay!
Question: A diary is 148 mm wide and 210 mm high. How do you find the diagonal of the diary??

Please give calculations.

All of the people on Yahoo answers asked this question but did not receive the answer I am seeking. I already got 210 pokemon but I need a little more elaboration/directions. Thank you (I always award ten points)!

210/365 : The shore

Project: 365 days of SQUARE BW

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