Question

If the sides of a triangle are 13 cm, 14 cm and 15 cm respectively then its area is ____cm2.
A) 80
B) 82
C) 84
D) 88

Answer 1

here a=13;b=14;c=15
so,s=(a+b+c)/2
=13+14+15/2=21.
$formula = \sqrt{s(s - a)(s - b)(s - c)}$
=√21(8)(7)(6)
=√7×3×4×2×7×2×3
=7×3×2×2
=84cm².
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