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 #1
avatar+98090 
+1

We can use this formula to find each new point

 

new point  = (old point - center)*scale factor + center

 

So

[ (-1, 3) - ( -2 , -2) ] * 2 + (-2, -2)  = [ 1 , 5 ] *2 + (-2,-2)  = (2, 10) + (-2, -2)  = (0, 8)

 

[ (-5, 2) - ( -2, -2) ] *2 + (-2, -2)  =  [ -3, , 4]*2 + (-2,-2)  = ( -6, 8 ) + (-2, -2) = (-8, 6)

 

[(-4, -2) - (-2, -2) ] *2 + (-2, -2)  = [ (-2, 0) ]*2 + (-2, -2)  = (-4, 0) + (-2, -2) = (-6, -2)

 

[ (1,1) - (-2, -2)]*2 + (-2,-2)  = [ (3, 3]*2 + (-2, -2)  = (6, 6) + (-2, -2)  = (4, 4) 

 

Here's a pic :

 

 

cool cool cool

 Oct 18, 2018
edited by CPhill  Oct 18, 2018

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