[tex]a)\\a^2=2*(2cm)^2\\a^2=2*4cm^2\\a^2=8cm^2\\a=\sqrt{8cm^2}=2\sqrt2cm\\\\b) \\2b^2=(7\sqrt2cm)^2\\2b^2=98cm^2 /:2\\b^2=49cm^2\\b=7cm\\\\c) \\2c^2=(5cm)^2 \\2c^2=25cm^2 /:2\\c^2=12.5cm^2\\c=\sqrt{12.5}cm\\\\d) \\d^2=2*(5cm)^2\\d^2=2*25cm^2\\d^2=50cm^2\\d=\sqrt{50cm^2}=\sqrt{25*2}cm=5\sqrt2cm\\\\e) \\e^2=2*(4\sqrt5cm)^2\\e^2=2*80cm^2\\e^2=160cm^2\\e=\sqrt{160cm^2}=\sqrt{4*4*10}cm=4\sqrt{10}cm\\[/tex]
[tex]f) \\2f^2=(8cm)^2\\2f^2=64cm^2/:2\\f^2=32cm^2\\f=\sqrt{32cm^2}=\sqrt{32}cm=\sqrt{2*16}cm=4\sqrt2cm\\\\g) \\2g^2=(5cm)^2\\2g^2=25cm^2 /:2\\g^2=12.5cm^2\\g=\sqrt{12.5}cm\\\\h) \\h^2=2*(6\sqrt3cm)^2\\h^2=2*108cm^2\\h^2=216cm^2\\h=\sqrt{216cm^2}=6\sqrt6cm\\\\i)\\2i^2=(\sqrt2cm)^2\\2i^2=2cm^2 /:2\\i^2=1cm^2\\i=1cm[/tex]
