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 Nov 28, 2018
 #1
avatar+101369 
+1

First one

 

DE/ DB = AC /AB

 

DE / DB =  AC / [ 2DB]         multiply through by DB

 

DE / 1 = AC / 2

 

DE = AC /2

 

DE = 12.6 / 2 =   6.3

 

 

cool cool cool

 Nov 28, 2018
 #2
avatar+101369 
+1

Second one

 

Because VU   splits QS and RS proportionally, then VU is  ll QR is  ll TR

And because VT splits QR and QS proportionally, then VT is  ll RS ll RU

 

So...TVUR is a parallelogram because opposite sides are parallel

 

Then   VU = TR  = 6

 

So....QR  = 2*TR = 2*6  =   12

 

 

cool cool cool

 Nov 28, 2018

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