+0  
 
0
127
4
avatar+273 

Help!

LaughingFace  Apr 9, 2018
 #1
avatar+92477 
+1

The first one is a little tricky

If  ABC  is similar to FDE...then

 

AB            BC                AC

__     =     ___     =        ___

FD            DE                FE

 

Notice that DE  is 1/2   of   BC

DE  =  2

BC  =  4   

 

FE  is  1/2  of AC

AC  =  8

So....FE   =  4

 

And  note that   (2,1)  is  4  units from E

 

So   (2,1)   =  F

 

cool cool cool

CPhill  Apr 9, 2018
 #2
avatar+273 
0

and the second one? That first one was tricky. 

LaughingFace  Apr 9, 2018
 #3
avatar+92477 
+2

We have  these   relationships

 

 ΔABC   similar  to  ΔBDC    similar   to   ΔADB

 

Look  at  the first two triangles....note that....

 

AC            BC

___   =      ___

BC            DC

 

 

So   "B"  is true

 

 

cool cool cool

CPhill  Apr 9, 2018
 #4
avatar+273 
+1

thanks so much!

LaughingFace  Apr 9, 2018

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