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[tex]\boxed{\begin{array}{l}\tt a)~\sf d=\ell\sqrt{3}\\\sf d=2,5\sqrt{3}~cm\\\sf A_t=6\cdot\ell^2\\\sf A_t=6\cdot2,5^2\\\sf A_t=37,5~cm^2\\\tt b)~\sf d=\sqrt{2^2+2^2+2,5^2}\\\sf d=\sqrt{4+4+6,25}\\\sf d=\sqrt{14,25}\\\sf d=3,24~cm\\\sf A_t=2\cdot(2\cdot2+2\cdot2,5+2\cdot2,5)\\\sf A_t=2\cdot(4+5+5)\\\sf A_t=2\cdot14\\\sf A_t=28~cm^2\\\sf d=\sqrt{3^2+1,5^2+2^2}\\\sf d=\sqrt{9+2,25+4}=\sqrt{15,25}=3,9~cm\\\sf A_t=2\cdot(3\cdot1,5+1,5\cdot2+3\cdot2)\\\sf A_t=2\cdot(4,5+3+6)\\\sf A_t=2\cdot13,5=27~cm^2\end{array}}[/tex]
