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shewolfangz

  • 3 years ago

a triangle and a rectangle are drawn on a page so that they overlap as shown. inside these figures are placed the digits from 0 to 9. if there are six digits in the triangle and eight digits in the rectangle, how many digits are in the part that belongs to both figures

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  1. shewolfangz
    • 3 years ago
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    i dnt ge the working out

  2. shewolfangz
    • 3 years ago
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    get*

  3. hartnn
    • 3 years ago
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    six digits in the triangle-->Let T =6 eight digits in the rectangle---->Let R=8 Total = 10 digits. = T union R (in other words, T OR R) get this much ?

  4. shewolfangz
    • 3 years ago
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    how do u get 10 digits?

  5. hartnn
    • 3 years ago
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    0 to 9 means total 10 digits i assumed that the digits are not repeated, which is a fair assumption here...

  6. shewolfangz
    • 3 years ago
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    ohk...no they not repeated

  7. hartnn
    • 3 years ago
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    digits are in the part that belongs to "both" figures = T AND R (T intersection R) = ...... there is a formula for this, you know ? in terms of T,R and T UNION R

  8. shewolfangz
    • 3 years ago
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    but..how do u do year 7 working out..im suposed to draw the diagram and stuff..

  9. hartnn
    • 3 years ago
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    'year 7 working out.' ?? i didn't get you..

  10. hartnn
    • 3 years ago
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    |dw:1352896076101:dw|

  11. shewolfangz
    • 3 years ago
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    im in year 7

  12. shewolfangz
    • 3 years ago
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    |dw:1352896192555:dw|

  13. shewolfangz
    • 3 years ago
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    that's what the question look like

  14. hartnn
    • 3 years ago
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    |dw:1352896267033:dw| i am not sure i can give you exact working required by your course/teacher, but i can make u understand how to get the answer....

  15. shewolfangz
    • 3 years ago
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    ok..

  16. hartnn
    • 3 years ago
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    now look at that figure, if u want total area of composite figure, will it be appropiate to add the area of triangle and rectangle ?

  17. shewolfangz
    • 3 years ago
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    um...no?

  18. hartnn
    • 3 years ago
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    why ?

  19. shewolfangz
    • 3 years ago
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    i don't know

  20. shewolfangz
    • 3 years ago
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    by the area of composite figure do u mean the overlapped shape?

  21. hartnn
    • 3 years ago
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    yes,. because then you will consider the "intersection part" twice. once in rectangle and once in triangle, got this ?

  22. shewolfangz
    • 3 years ago
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    um..kinda

  23. hartnn
    • 3 years ago
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    so to get area of composite figure, u need to subtract are of intersection, right ?

  24. shewolfangz
    • 3 years ago
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    ..uh..yea..

  25. hartnn
    • 3 years ago
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    so , we get TOTAL = RECT +TRIANGLE - INTERSECTION. in this case, total = 10 , Rect = 8, triangle =6 u just need intersection

  26. shewolfangz
    • 3 years ago
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    uhuh

  27. hartnn
    • 3 years ago
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    not clear ?

  28. shewolfangz
    • 3 years ago
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    clear

  29. hartnn
    • 3 years ago
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    so, 10 = 8+6-x where x is digits that belongs to both figures

  30. hartnn
    • 3 years ago
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    x= ?

  31. shewolfangz
    • 3 years ago
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    hmm equations..lets see

  32. shewolfangz
    • 3 years ago
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    4?

  33. hartnn
    • 3 years ago
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    yes, so there are 4 numbers that belong to both..

  34. shewolfangz
    • 3 years ago
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    ohk..

  35. hartnn
    • 3 years ago
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    will u be able to solve similar problems ?

  36. shewolfangz
    • 3 years ago
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    i think so yes

  37. shewolfangz
    • 3 years ago
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    thnx for ur help hartnn

  38. shewolfangz
    • 3 years ago
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    now i need to get back to my other hw

  39. hartnn
    • 3 years ago
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    welcome ^_^ and good luck....

  40. shewolfangz
    • 3 years ago
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    thnx for help!!!

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