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Danny_Boy

What is the area of ABC below? If necessary, round your answer to two decimal places.

  • one year ago
  • one year ago

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  1. Danny_Boy
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    • one year ago
  2. Danny_Boy
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    i got the area form each triangle sepreatly then added them up and got 128.77

    • one year ago
  3. Preetha
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    That should be right. You have two sides, you can calculate the third.

    • one year ago
  4. slopez95
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    i'll check your answer and see if it's right. Give me a second :)

    • one year ago
  5. Danny_Boy
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    thank you :)

    • one year ago
  6. Danny_Boy
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    37.13

    • one year ago
  7. Danny_Boy
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    @slopez95

    • one year ago
  8. slopez95
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    you got that for the bigger one? because I got 21.81. hmm how did you get that?

    • one year ago
  9. Danny_Boy
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    i multiply 7.9 and 23.2 for the big one then divide by 2 same for the small one 9.4x7.9 then divide by 2

    • one year ago
  10. slopez95
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    hmm that might be why. i used a^2+b^2=c^2 to get the base of both triangles first. to get the area you do bh/2. base is the bottom measurement.

    • one year ago
  11. Danny_Boy
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    well i have to find the area so i found he area of both then add them together i think thats how?

    • one year ago
  12. slopez95
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    yes but you're finding the area the wrong way. first you have to find the base. without the base measurement you can't find area. once you do it that way, you can add them

    • one year ago
  13. Danny_Boy
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    poo so how can i find the base? can you help me plz :)

    • one year ago
  14. slopez95
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    okayy. a triangle is sides a, b and c. now the slanted side is always c. For the smaller one the sides are b=7.9 and c=9.4. plug it into this and solve. a^2+b^2=c^2 let me know what you get.

    • one year ago
  15. Danny_Boy
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    so it would be 62.41 and 88.36 then subtract = 25.9 right?

    • one year ago
  16. slopez95
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    yes! now find the square root since that is squared right now.

    • one year ago
  17. Danny_Boy
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    5.09?

    • one year ago
  18. slopez95
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    exactly :) now do the same for the bigger triangle.

    • one year ago
  19. Danny_Boy
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    i got square root of 21.81?

    • one year ago
  20. Danny_Boy
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    26.9?

    • one year ago
  21. slopez95
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    oh wait, no i'm sorry. now with each of the bases you do bh/2 to get the area. my bad. So it'll be 5.09*7.9 and 21.81*7.9

    • one year ago
  22. Danny_Boy
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    hahaha lol its cool =)

    • one year ago
  23. Danny_Boy
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    i got 40.211 and 172.299?

    • one year ago
  24. slopez95
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    yes :) now add lol

    • one year ago
  25. Danny_Boy
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    212.51?

    • one year ago
  26. slopez95
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    you got it :)

    • one year ago
  27. Danny_Boy
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    thank you ur awesome

    • one year ago
  28. slopez95
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    No problem :) thanks.

    • one year ago
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