+0  
 
0
138
1
avatar+316 

 

this is geomotry can you pls tell me how to do this

cerenetie  Feb 19, 2018
 #1
avatar+88871 
+3

 

1)    We need this formula

 

Old point '  =  ( Old point  - Dilation center )*Scale Factor + Dilation center

 

Also  note that   (a,b) + (c, d)  =  ( a + c , b + d)

And  (a, b) * c  =  (c*a, c*b)

 

So....to find the post-image of A   

 

A'   =  ( A  - Dilation Center)*Scale Factor + Dilation Center

A' =  [  (-4,  4) - (-1, 1) ] *  (1/3)   +  (-1/1)

A' =  [ -3, 3] *(1/3) + (-1, 1)

A'  = [ -1, 1] + (-1, 1)  =   (-2, 2)

 

Can you find the other two points using this formula to B and C ???...if not, let me know

 

The second problem is similar...just apply the formula to each point and graph the results

 

 

(3)    10  * (2/3)   =  20/3  =  AB '  

 

(4)    13 * (3/2)  =  39/2  =  CD ' 

 

 

 

cool cool cool

CPhill  Feb 19, 2018

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