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EXOEXOEXO

  • one year ago

find the area of the trapezoid

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  1. EXOEXOEXO
    • one year ago
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    |dw:1436916462396:dw|

  2. pooja195
    • one year ago
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    \[\huge~\rm~A=\frac{ a+b }{ 2}h\]

  3. pooja195
    • one year ago
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    Can you figure out what a b h are?

  4. pooja195
    • one year ago
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    remember that a trapezoid has 2 bases

  5. EXOEXOEXO
    • one year ago
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    the answer choices are a) 44 b) 48 c) 90 cd) 100

  6. EXOEXOEXO
    • one year ago
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    *d) 100

  7. jdoe0001
    • one year ago
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    hmmmm how did you get 100?

  8. pooja195
    • one year ago
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    \[\huge~\rm~A=\frac{ a+b }{ 2}h\]Can you figure out what a b h are?

  9. pooja195
    • one year ago
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    @jdoe0001 he meant the answer choice :P

  10. jdoe0001
    • one year ago
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    ohh ahemm hehe

  11. EXOEXOEXO
    • one year ago
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    a and b are the bases of the trapezoid

  12. pooja195
    • one year ago
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    right what are their values?

  13. jdoe0001
    • one year ago
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    hint |dw:1436917508346:dw|

  14. EXOEXOEXO
    • one year ago
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    8+14/2=22/2=11 5x11=55

  15. pooja195
    • one year ago
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    a=8 b=14 h=?

  16. jdoe0001
    • one year ago
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    |dw:1436917675313:dw|

  17. EXOEXOEXO
    • one year ago
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    how do you find the height?

  18. pooja195
    • one year ago
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    its given

  19. jdoe0001
    • one year ago
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    well.. I should have put the tickmark on the side itself =( |dw:1436917793358:dw|

  20. pooja195
    • one year ago
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    |dw:1436916989730:dw| look at this thing that @jdoe0001 drew

  21. Vocaloid
    • one year ago
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    we have a bit of a misunderstanding here, the height isn't 5 |dw:1436917040544:dw|

  22. jdoe0001
    • one year ago
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    if the two slanted sides, are equal, that means, the angles they make above and down below, are also equal and if those angles are equal, the "gaps" at the bottom are also equal

  23. Vocaloid
    • one year ago
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    now, if we take one of the triangles on the side, we can solve for height using the Pythagorean theorem |dw:1436917106452:dw|

  24. EXOEXOEXO
    • one year ago
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    h=2

  25. jdoe0001
    • one year ago
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    hehee anyhow @EXOEXOEXO Vocaloid just pull "3" out of his pocket there any ideas where he got that from?

  26. EXOEXOEXO
    • one year ago
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    nvm

  27. Vocaloid
    • one year ago
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    oh, right I should probably explain where the 3 came from, haha |dw:1436917232181:dw|

  28. EXOEXOEXO
    • one year ago
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    h=4

  29. Vocaloid
    • one year ago
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    (I drew a rectangle connecting the bottom of the trapezoid to the top of the rectangle, giving us 8 + 2x = 14, meaning that each of the little segments is 3) but yeah, h = 4, and now you can go back to the formula

  30. wolf1728
    • one year ago
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    I found a formula for the height here: http://www.1728.org/quadtrap.htm We will have to call: a = 14 b = 5 c = 8 d = 5 height^2 = (a+b+-c+d)*(-a+b+c+d)*(a-b-c+d)*(a*b-c-d) / 4 * (a -c)^2 height^2 = (16*4*6*6) / 4 * 36 height^2 = 16 height = 4

  31. wolf1728
    • one year ago
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    Hey hey we agree about the height !! :-)

  32. EXOEXOEXO
    • one year ago
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    thanks everyone for helping me!

  33. wolf1728
    • one year ago
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    Area = [(a+c) / 2] * height Area = [(14 + 8) / 2] * 4 Area = 44

  34. wolf1728
    • one year ago
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    'sokay - glad to help out :-)

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