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Danny_Boy

  • 2 years ago

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

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

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

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

  5. Danny_Boy
    • 2 years ago
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    thank you :)

  6. Danny_Boy
    • 2 years ago
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    37.13

  7. Danny_Boy
    • 2 years ago
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    @slopez95

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

  9. Danny_Boy
    • 2 years ago
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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

  10. slopez95
    • 2 years ago
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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.

  11. Danny_Boy
    • 2 years ago
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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?

  12. slopez95
    • 2 years ago
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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

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

  14. slopez95
    • 2 years ago
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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.

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

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

  17. Danny_Boy
    • 2 years ago
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    5.09?

  18. slopez95
    • 2 years ago
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    exactly :) now do the same for the bigger triangle.

  19. Danny_Boy
    • 2 years ago
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    i got square root of 21.81?

  20. Danny_Boy
    • 2 years ago
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    26.9?

  21. slopez95
    • 2 years ago
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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

  22. Danny_Boy
    • 2 years ago
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    hahaha lol its cool =)

  23. Danny_Boy
    • 2 years ago
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    i got 40.211 and 172.299?

  24. slopez95
    • 2 years ago
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    yes :) now add lol

  25. Danny_Boy
    • 2 years ago
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    212.51?

  26. slopez95
    • 2 years ago
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    you got it :)

  27. Danny_Boy
    • 2 years ago
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    thank you ur awesome

  28. slopez95
    • 2 years ago
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    No problem :) thanks.

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