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12c
a2 + b2 = c2. 62 + 82=c2. 36+64=c2. 100=c2. sqrt(100)=sqrt(c2). c=10. So the diagonal is 10 m. long.
(c2 + 11)(c2 - 11)
C2+6c-9
a2+b2=c2 22+42=c2 4+16=c2 20=c2 c=square root of 20