a^2+b^2=c^2
12^2+b^2=13^2
144+b^2=169
b^2=25
b=5
S=5*12/2=30
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a^2+b^2=c^2
12^2+b^2=13^2
144+b^2=169
b^2=25
b=5
S=5*12/2=30