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a=√(c²-b²)=√(15²-12²)=√(225-144)=√81=9
b=√(c²-a²)=√(8²-6²)=√(64-36)=√28=√4√7=2√7
c=√(a²+b²)=√(6²+6²)=√(2×6²)=√6²√2=6√2