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sides of triangle,
a=13cm
b=14cm
c=15cm
perimeter of triangle=13+14+15
=42
semi perimeter of triangle,s=42/2
=21
by heron's formula,
area of the triangle=√s(s-a)(s-b)(s-c)
=√21(21-13)(21-14)(21-15)
=21××8×7×6
=84
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