[tex] \sqrt{216} = \sqrt{6 ^{2} + 6 } = 6 \sqrt{6} [/tex]
[tex] \sqrt{18 0| } = 6 \sqrt{5} [/tex]
[tex] \sqrt{147} = 7 \sqrt{3} [/tex]
[tex] \sqrt{252} = 6 \sqrt{7} [/tex]
[tex] \sqrt{448} = 4 \sqrt{7} [/tex]
[tex] \sqrt{405} = 9 \sqrt{5} [/tex]
[tex] \sqrt{242} = 11 \sqrt{2} [/tex]