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 #1
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+2

We can use Heron's  formula here

 

s = the semi-perimeter   = [9 + 4 +7 ]  / 2 =  20/2  =  10

 

The Area  is

 

√ [ s  (s - a) (s - b) (s - c)  ]         where a,b,c  are  the sides of the triangle

 

So we have

 

√ [ 10 * ( 10-9) (10 -4) (10 - 7) ]  =

 

 

√ [  10 * 1 * 6 * 3  ]  =

 

√ 180  =

 

√ [36 * 5 ] = 

 

6√5   units^2

 

 

cool cool cool

 Mar 25, 2020

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