3. Find the area of the triangle in which
(i) a = 13 m, b=14 m, c=15 m:
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Answer:
a=13,b=14,c=15
s=a+b+c/2
=13+14+15/2
=42/2
=21
area=√s(s-a)(s-b)(s-c)
=√21(21-13)(21-14)(21-15)
√21×8×7×6
=√7056
=84
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