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elizabethann509

I don't need an answer, I just need some help on how to do this. Your uncle is making you a desk for you to take to college. One side of the desk is 32 inches and the diagonal length is 36 inches. What is the length of the other side of the desk? I know that you have to use the Pythagorean theorem for this and I know how to find the hypotenuse if I know the measures of the legs. Do I do the exact same thing with this only I'm looking for the measure of the leg? Or is it different?

  • one year ago
  • one year ago

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  1. elizabethann509
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    |dw:1336337420890:dw|

    • one year ago
  2. amistre64
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    fill in the parts to the pythag and then rearrange to solve the missing

    • one year ago
  3. mathdood
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    well if a^2= b^2+c^2 and you have a and either b or c then just solve for b or c

    • one year ago
  4. amistre64
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    a^2 + b^2 = c^2 a^2 = c^2 - b^2

    • one year ago
  5. elizabethann509
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    So, normally if I were to be looking for the hypotenuse then the legs would be A and B and the hypotenuse is C? So I rearrange it accordingly to what I know like the equations you just showed me?

    • one year ago
  6. amistre64
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    yep

    • one year ago
  7. elizabethann509
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    @amistre64 why did you put the subtraction sign instead of the addition?

    • one year ago
  8. amistre64
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    becasue when you subtract b^2 from each side ... well, .... you subtract it

    • one year ago
  9. elizabethann509
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    That doesn't make sense (what you just wrote). Also, I still don't get it. Because it's: a^2 + b^2 = c^2 Why does that become a subtraction sign when it is rearranged?

    • one year ago
  10. amistre64
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    well, lets use real numbers 5 + 3 = 8 does 5 = 8 + 3 ?

    • one year ago
  11. mathdood
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    because that is how algebra works if you have 4 = 2 + x and you want to figure out x you take 2 from both sides and you get x = 4- 2 this si the same and a b and c are just variables it doesn't matter how you write them just know that when you are adding it is for the hypotenuse and when you are subtracting it is for one of the two sides.

    • one year ago
  12. amistre64
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    the equal sign represent balance between the weight of 2 opposing sides 5 + 3 = 8 is balanced and equal ; if we subtract 3 from each side it stays equal -3 -3 ---------- 5 + 0 = 5

    • one year ago
  13. elizabethann509
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    Ohh okay! That makes sense now that you showed that example. Thanks :) I'll give it a try and see if I can get it right!

    • one year ago
  14. amistre64
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    good luck

    • one year ago
  15. elizabethann509
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    Thanks!

    • one year ago
  16. elizabethann509
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    Still having some trouble on how to figure this out :/ I fill it in but I would come out with negatives every time with the way I am doing this. I'm doing it like you both said so I'm not sure what I'm doing wrong?

    • one year ago
  17. elizabethann509
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    No idea what to do now! :p

    • one year ago
  18. amistre64
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    youre most likely mixing up your hypotenuse and side; the negative just means youve got them backwards 5 - 3 = 2 3 - 5 = -2

    • one year ago
  19. amistre64
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    just drop the negative and youll be fine

    • one year ago
  20. amistre64
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    a^2 = 36^2 - 32^2 a = sqrt(36^2 - 32^2)

    • one year ago
  21. amistre64
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    we can also trim down some computations 36 = 9*4 32 = 8*4 (9*4)^2 - (8*4)^2 = 4^2 (9^2 - 8^2) a = 2 sqrt(81-64)

    • one year ago
  22. elizabethann509
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    Wow, i was doing that wayyy different i think lol. i was doing 36x36 and 32x32 and i got numbers in the thousand range. so i just multiply it by 2 then? lol

    • one year ago
  23. amistre64
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    the more you can simply to begin with, the smaller your calculations will be either way itll turn out the same if you do the mathing right :)

    • one year ago
  24. elizabethann509
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    Okay lol. Thank you soo much! I was completely confused but I get it now :)

    • one year ago
  25. amistre64
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    youre welcome

    • one year ago
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