+0  
 
0
51
8
avatar+623 

i keep coming to the answer 4 but its actually G

 

 

http://prntscr.com/l6tg8c

 

how?..

critical  Oct 16, 2018
edited by critical  Oct 16, 2018
 #1
avatar+307 
+1

I think anwer is G. 6 units long

Dimitristhym  Oct 16, 2018
 #2
avatar+623 
+1

IM SORRY it is G  lol..

critical  Oct 16, 2018
 #4
avatar+307 
+1

ok i prove it below! 

Dimitristhym  Oct 16, 2018
 #3
avatar+307 
+3

\(AD=AB + BD \)

so  \(AB = 30 - 20 =10 \)

and \(AB = AC + CD \)

so \(CD = 30 - 16 = 14 \)

Finally \(AD = AB + BC + CD \)

so \(BC = 30 - 10 - 14 = 6 \)

so \(BC = 6\)

Dimitristhym  Oct 16, 2018
 #5
avatar+623 
+2

Thank you !! i had to reload the page to see the answer

 

very much appreciated!

critical  Oct 16, 2018
 #7
avatar+307 
+2

You're wellcome!

Dimitristhym  Oct 16, 2018
 #6
avatar
+3

AD =30, AC =16

AD - AC =30 -16 =14 - the length of CD

But BD = 20, so:

BD - CD =BC

20 - 14 = 6 - the length of BC!!, or "G".

Guest Oct 16, 2018
edited by Guest  Oct 16, 2018
 #8
avatar+90968 
+2

[AD  -  AC]  =  [30  - 16 ] = 14  = CD

 

[BD  - CD ]  = [20  - 14]  = 6   =   BC

 

 

cool cool cool

CPhill  Oct 16, 2018

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