Posted by shay on Wednesday, February 15, 2012 at 8:56pm.
c^2 = a^2+b^2
= (3-1)^2 + (5-3)^2
= 2^2 + 2^2
= 4+4
= 8
c = √8
= √(4*2)
= √4*√2
= 2√2
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