heron's formula for the triangle 9cm × 8cm × 7cm
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Step-by-step explanation:
s=a+b+c/2
s=9+8+7/2=24/2=12
area of triangle=√s(s-a)(s-b)(s-c)
=√12(12-9)(12-8)(12-7)
=√12x3x4x5
=√720
=12√5 units
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