+0  
 
0
256
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avatar+464 

Thank you in advance for helping me solve this. Can I please get it today before 6:30 pm if possible please!

 

 Oct 8, 2018
 #1
avatar+464 
+1

This is what I got and I feel it is right but I am not so sure, please help me on this

 

 Oct 8, 2018
 #2
avatar+107656 
+1

Since triangles CBD  and  CAD  are on the same base (CD)...then their areas are to each other as their heights

 

So  

 

[ CAD ] / [ CBD ]  =  12 / 7

 

So

 

[ CAD ]  = (12/7) [ CBD ]

 

So

 

[ CBDA ] + [CBD ]  =  [ CAD ]

 

15   +   [CBD ]  =  (12/7) [ CBD ]

 

15  =  (12/7) [ CBD ] - [CBD ]

 

15  =  (12/7) [CBD ] - (7/7)[CBD]

 

15 = (5/7) [CBD ]

 

(7/5)(15)  = CBD

 

21  =  CBD

 

But  CAD  =  (12/7) [ CBD ]  = (12/7) (21) =  12 * 3  = 36  = [CDA]

 

You are correct  !!!

 

 

cool cool cool

 Oct 8, 2018
edited by CPhill  Oct 8, 2018
 #3
avatar+464 
+1

Thank you so much. I keep cross checking my work so much and I keep feeling that my answer is wrong, so I keep checking my work like this every single time

 Oct 8, 2018
 #4
avatar+107656 
0

HAHAHA!!!...on these geometry problems....I'm never too sure, either...!!!

 

 

cool cool cool

CPhill  Oct 8, 2018

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