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mathmath333

  • one year ago

Counting Problem

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  1. anonymous
    • one year ago
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    1, 2, 3, 4 ...

  2. mathmath333
    • one year ago
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    1 Attachment
  3. yadu123
    • one year ago
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    25 grey dots 5 blue

  4. yadu123
    • one year ago
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    6 green lines 5 red

  5. yadu123
    • one year ago
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    20 squares

  6. mathmath333
    • one year ago
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    |dw:1440255088214:dw|

  7. mathmath333
    • one year ago
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    \(\large \color{black}{\begin{align} & \normalsize \text{The red and green lines are parallel to eachother.}\hspace{.33em}\\~\\ & \normalsize \text{Find the number of parallelograms formed.}\hspace{.33em}\\~\\ \end{align}}\)

  8. yadu123
    • one year ago
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    i think its still 20 parralelograms

  9. anonymous
    • one year ago
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    there is a technique we can use

  10. anonymous
    • one year ago
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    btw, how did you draw it like that? it looks cool

  11. yadu123
    • one year ago
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    a parralleogram is a shape with opposite sides parallel and opposite angles equal

  12. mathmath333
    • one year ago
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    Using geozebra

  13. mathmath333
    • one year ago
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    |dw:1440255355482:dw|

  14. yadu123
    • one year ago
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    so is it 20?

  15. mathmath333
    • one year ago
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    https://www.geogebra.org/

  16. mathmath333
    • one year ago
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    |dw:1440255407583:dw| this is also a prallelogram so answer is not 20

  17. yadu123
    • one year ago
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    oh

  18. ganeshie8
    • one year ago
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    |dw:1440255451325:dw|

  19. ganeshie8
    • one year ago
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    To form a parallelogram, you need to choose any 2 red lines and any 2 green lines

  20. mathmath333
    • one year ago
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    is their a predefined formula

  21. ganeshie8
    • one year ago
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    its not formula as such, you can see that there are 5 red lines, how many ways can you choose 2 red lines ?

  22. mathmath333
    • one year ago
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    but why r u choosing 2 red line

  23. mathmath333
    • one year ago
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    and 2 grren lines

  24. ganeshie8
    • one year ago
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    how many sides are there in a parallelogram ?

  25. ytrewqmiswi
    • one year ago
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    a(a -1) x b(b -1) =number of parallelograms m nd n are the number of lines :)

  26. mathmath333
    • one year ago
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    4

  27. ganeshie8
    • one year ago
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    |dw:1440255729752:dw|

  28. ganeshie8
    • one year ago
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    first convince yourself that you must choose exactly 2 red lines and 2 green lines to form a parallelogram

  29. mathmath333
    • one year ago
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    ok it forms only 1 parellelofram

  30. ganeshie8
    • one year ago
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    try some examples picking different pairs of lines

  31. mathmath333
    • one year ago
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    ok i get it

  32. mathmath333
    • one year ago
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    the link has a formula

  33. ytrewqmiswi
    • one year ago
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    yes :)

  34. mathmath333
    • one year ago
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    thanks to google

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