+0  
 
+1
31
2
avatar+511 

Thanks

off-topic
 Jan 9, 2019
 #1
avatar+94526 
+2

Note that triangle EAC is similar to triangle DBC

 

Therefore

 

EA / EC  =   DB / DC       so

 

80 / 10   = DB / 20

 

8 / 1  =  DB / 20

 

8 =  DB /20       multiply both sides by 20

 

160   =  DB   =   "x"

 

 

cool cool cool

 Jan 9, 2019
 #2
avatar+511 
+1

thanks, CPhill

Synth  Jan 9, 2019

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