+0  
 
+1
163
1
avatar+173 

 

Is 25 correct?

Johnnyboy  Dec 11, 2017
 #1
avatar+86888 
+2

Distance  on one side  using  ( 1, 5)  and  (4,3)   =

 

sqrt  [  ( 1 - 4)^2  + (3 - 5)^2 ]  =  sqrt  [ 9 + 4]  =  sqrt [13]   =  A

 

Distance of the other side using  ( 1, 5)  and ( -3, -1)  =

 

sqrt [  ( -3 - 1)^2  + (-1 - 5)^2 ]  =  sqrt [ 16 + 36 ]  =  sqrt [52]  = 2sqrt [ 13 ]  =  B

 

Area  =  A * B   =   sqrt [13] * 2 sqrt [13 ]   =   2 * 13   =   26 units^2

 

 

cool cool cool

CPhill  Dec 11, 2017

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