Answers

2016-03-10T19:13:42+05:30
Simce diagonal=root under (L^2+B^2+h^2)
also,diagonal=17
root under(12^2+x^2+9^2)=17
squaring both sides:
144+x^2+81=289
225+x^2=289
x^2=289-225=64
x=root under 64=8cm
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