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2016-05-03T11:52:04+05:30
Consider the rectangle ABCD with a diagonal AC
By using pythagoras theorem 
(AC)² = (AB)² + (BC)²
(AC)² = 12² + 5² = 144 + 25 = 169 = `13²
AC = 13cm
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2016-05-03T12:00:18+05:30

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The sides of rectangle makes 90° with each other.
So applying Pythagoras theorem,
diagonal, d = √[(12)²+(5)²] 
                  =√(144+25) =√169
                  = 13 cm
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