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anonymous

  • one year ago

Given that: BC=4 BD=9 DE=9 AB=x What is the value of x? (its a triangle)

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  1. anonymous
    • one year ago
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    @Peaches15 @ganeshie8 @Crissy15 plz

  2. anonymous
    • one year ago
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    @Peaches15 @ganeshie8 @Crissy15 plz

  3. anonymous
    • one year ago
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    @crissy15 sorry didnt know

  4. anonymous
    • one year ago
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    https://www.khanacademy.org/mission/algebra-basics/task/6258061099532288

  5. anonymous
    • one year ago
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    |dw:1439401165183:dw|

  6. ganeshie8
    • one year ago
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    how many triangles do you see above ?

  7. anonymous
    • one year ago
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    2

  8. ganeshie8
    • one year ago
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    Notice that those two triangles have same angles

  9. ganeshie8
    • one year ago
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    so they are similar, you can setup an useful proportion to solve the unknown

  10. ganeshie8
    • one year ago
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    |dw:1439401493066:dw|

  11. ganeshie8
    • one year ago
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    \[\large \dfrac{x}{4} = \dfrac{x+9}{9}\] cross multiply and solve \(x\)

  12. anonymous
    • one year ago
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    \[x=\frac{ 36 }{ 5 }\]

  13. ganeshie8
    • one year ago
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    looks good!

  14. anonymous
    • one year ago
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    and in decimal is 7.2

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