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s= 1/2(a+b+c)
1/2(12+13+5)
s=15
L=√s(s-a)(s-b)(s-c)
√15(15-12)(15-13(15-5)
√15(3)(2)(10)
√900
=30
abc/4L = 12.13.5/4.30 =6.5