glory1331 glory1331

14-11-2018
Mathematics

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Using Herons formula could someone please help me

Using Herons formula could someone please help me class=

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wegnerkolmp2741o wegnerkolmp2741o

14-11-2018

A = sqrt{s(s-a)(s-b)(s-c)}

s={a+b+c}/{2}.

s = (7.2+6.7+4.5)/2 = 18.4/2 =9.2

A =sqrt (9.2 *(9.2-7.2) *(9.2-6.7) * (9.2-4.5) )

=sqrt( 9.2*2*2.5*4.7)

= sqrt(216.2)

=14.7

Choice C

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