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\(\frac{a}{6}\)=\(\frac{b}{8}\)=\(\frac{c}{11}\)=x

=> a=6x; b=8x; c=11x

2b²=c²+28

=>2(8x)²=(11x)²+28

=>2.64x²=121x²+28

=>128x²-121x²=28

=>7x²=28 =>x²=4 =>x=2

a=12; b=16; c=22

chu vi: 50

a=12x

b=12y

c=12z

12x.4=12y.6=12z.15

=>48x=72y=180z

=>\(\frac{x}{\frac{1}{48}}\)=\(\frac{y}{\frac{1}{72}}\)=\(\frac{z}{\frac{1}{180}}\)=k

=>x=\(\frac{k}{48}\);y=\(\frac{k}{72}\);z=\(\frac{k}{180}\)=>k=BCNN=720

=>x=\(\frac{1}{48}\).k=\(\frac{1}{48}\).720=15

a=12.15=180