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vmathhelp

  • 2 years ago

Can someone help me with Geo Problem! Diagonal AC divides a trapezoid ABCD two similar triangles ABC and ACD. Find AC if BC=4cm and AD=9cm

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  1. vmathhelp
    • 2 years ago
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    @ganeshie8 I need help

  2. vmathhelp
    • 2 years ago
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    @ghazi @lalaly @AccessDenied

  3. kajolc.2496
    • 2 years ago
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    Are these triangles similar by area?

  4. kajolc.2496
    • 2 years ago
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    Is not there any fig. for this?

  5. campbell_st
    • 2 years ago
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    I think it looks like this|dw:1356206771435:dw| the angles marked x are equal by alternate angles in parallel lines

  6. ghazi
    • 2 years ago
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    |dw:1356207039082:dw|

  7. vmathhelp
    • 2 years ago
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    Now what do i do?

  8. ghazi
    • 2 years ago
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    have you provided whole information?

  9. vmathhelp
    • 2 years ago
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    yes

  10. kajolc.2496
    • 2 years ago
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    I think there is something we r missing..

  11. campbell_st
    • 2 years ago
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    well the corresponding sides in the triangles are triangle ABC and triangle ACD are AB AC AB DC BC AD now you need to use the ratio's of corresponding sides in similar triangles

  12. kajolc.2496
    • 2 years ago
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    but ques. does'nt say that it divides the triangles in equal areas!

  13. kajolc.2496
    • 2 years ago
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    that's wat i was confirming earlier

  14. vmathhelp
    • 2 years ago
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    AD:BC = 2.25

  15. kajolc.2496
    • 2 years ago
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    SIMILARITY CAN ONLY BE USED WHEN AREAS ARE EQUAL

  16. campbell_st
    • 2 years ago
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    oops corresponding side should be AC and DC so using the ratio of corresponding sides \[\frac{4}{9} = \frac{AB}{AC}= \frac{AC}{ DC}\]

  17. vmathhelp
    • 2 years ago
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    what happens next?

  18. vmathhelp
    • 2 years ago
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    @campbell_st

  19. campbell_st
    • 2 years ago
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    who knows.... it doesn't make sense to me... there seems to be something missing from the question.

  20. campbell_st
    • 2 years ago
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    Oh, and triangles can be similar and have different areas the ratio will be the linear ratio squared. so the ratio of areas in the triangles is ABC:ACD = (4/9)^2

  21. vmathhelp
    • 2 years ago
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    @ghazi is there missing info?

  22. ghazi
    • 2 years ago
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    i am confused

  23. vmathhelp
    • 2 years ago
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    wat r u confused about?

  24. ghazi
    • 2 years ago
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    there is something missing in it

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