Question

A crystal has a=2,b=3 and c=3oA and α=β=γ=90o. What is the length of the longest diagonal?

Answer 1

Since a b and c are perpendicular then the length of longest diagonal will be equal to

$\sqrt{a^2+b^2+c^2}=\sqrt{2^2+3^2+3^2}=\sqrt{22} \ A^o$