Answer :

Shadow1363

Answer:

13.5-6.6= 6.9 (nice)

a^2+b^2=c^2

6.9^2+b^2=7.7^2

b=3.41760149813

13.5+7.7+6.6+3.41760149813= 31.2176014981

( i might be wrong)

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