anonymous
  • anonymous
Given that: BC=4 BD=9 DE=9 AB=x What is the value of x? (its a triangle)
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
@Peaches15 @ganeshie8 @Crissy15 plz
anonymous
  • anonymous
@Peaches15 @ganeshie8 @Crissy15 plz
anonymous
  • anonymous
@crissy15 sorry didnt know

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anonymous
  • anonymous
https://www.khanacademy.org/mission/algebra-basics/task/6258061099532288
anonymous
  • anonymous
|dw:1439401165183:dw|
ganeshie8
  • ganeshie8
how many triangles do you see above ?
anonymous
  • anonymous
2
ganeshie8
  • ganeshie8
Notice that those two triangles have same angles
ganeshie8
  • ganeshie8
so they are similar, you can setup an useful proportion to solve the unknown
ganeshie8
  • ganeshie8
|dw:1439401493066:dw|
ganeshie8
  • ganeshie8
\[\large \dfrac{x}{4} = \dfrac{x+9}{9}\] cross multiply and solve \(x\)
anonymous
  • anonymous
\[x=\frac{ 36 }{ 5 }\]
ganeshie8
  • ganeshie8
looks good!
anonymous
  • anonymous
and in decimal is 7.2

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