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A.)  Diagonal of square in terms of its edge "a":
  Diagonal of square =  \sqrt{a^{2} +a^{2} }

                                 =  \sqrt{2a ^{2} }

                                 = a \sqrt{2}

b.)  Diagonal of rectangle in terms of its base "b" and height "h":

Diagonal of rectangle =  \sqrt{b ^{2} +h ^{2} }

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