Quantcast

Got Homework?

Connect with other students for help. It's a free community.

  • across
    MIT Grad Student
    Online now
  • laura*
    Helped 1,000 students
    Online now
  • Hero
    College Math Guru
    Online now

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

J.L. Group Title

PLEASE HELP! The figure below shows AB = 4 units and BD = 6 units. If the area of triangle ADE is 50 square units, what is the area of the trapezoid BCED? 40 square units 44 square units 48 square units 42 square units http://learn.flvs.net/webdav/assessment_images/educator_geometry_v14/pool_Geom_3641_Seg_Two_Exam_35/image0034e9d7dd7.jpg

  • 2 years ago
  • 2 years ago

  • This Question is Closed
  1. Calcmathlete Group Title
    Best Response
    You've already chosen the best response.
    Medals 3

    Are you familiar with the concept that similar figures have a ratio for area?

    • 2 years ago
  2. lgbasallote Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    de javu

    • 2 years ago
  3. J.L. Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Yea

    • 2 years ago
  4. Calcmathlete Group Title
    Best Response
    You've already chosen the best response.
    Medals 3

    I mean as in if there is a ratio between side lengths a : b, then the ratio fo the areas is \(a^2 : b^2\)

    • 2 years ago
  5. lgbasallote Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    im thinking area of big triangle - area of small triangle = area of trapezoid

    • 2 years ago
  6. J.L. Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Yea I know what you're talking about @Calcmathlete

    • 2 years ago
  7. Calcmathlete Group Title
    Best Response
    You've already chosen the best response.
    Medals 3

    Yup. First you have to find the area of the smaller triangle though. If a : b is 2 : 5, then what is \(a^2 : b^2\)?

    • 2 years ago
  8. J.L. Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    4:25

    • 2 years ago
  9. lgbasallote Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    how did you get 2:5 again?

    • 2 years ago
  10. J.L. Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Shouldn't it be 4:5?

    • 2 years ago
  11. Calcmathlete Group Title
    Best Response
    You've already chosen the best response.
    Medals 3

    The ratio of the similar triangles lgba. Now, set up a proportion between the two areas. \[\frac{4}{25} = \frac{x}{50}\]Solve for x.

    • 2 years ago
  12. Calcmathlete Group Title
    Best Response
    You've already chosen the best response.
    Medals 3

    Why do you say it should be 4 : 5?

    • 2 years ago
  13. J.L. Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Because that's the ratio of the corresponding sides...CB=4 and BE=5 so the ratio would be 4:5 or 0.8

    • 2 years ago
  14. Calcmathlete Group Title
    Best Response
    You've already chosen the best response.
    Medals 3

    Are we looking at the same picture?

    • 2 years ago
  15. J.L. Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Sorry I was looking at a different question haha

    • 2 years ago
  16. J.L. Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    shouldn't it be 4:6 then or 2:3?

    • 2 years ago
  17. Calcmathlete Group Title
    Best Response
    You've already chosen the best response.
    Medals 3

    Not quite. That isn't the ratio of the triangles. Think about it. 6 is a part of the side of a triangle. Not the actual triangle.

    • 2 years ago
  18. J.L. Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Okay got it x=8

    • 2 years ago
  19. Calcmathlete Group Title
    Best Response
    You've already chosen the best response.
    Medals 3

    Ok. Now subtract the areas of the two triangles.

    • 2 years ago
  20. J.L. Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    I know the area of the first triangle is 50...what's the area of the second?

    • 2 years ago
  21. Calcmathlete Group Title
    Best Response
    You've already chosen the best response.
    Medals 3

    Area of the second triangle = 8

    • 2 years ago
  22. J.L. Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Ohhh 50-8=42

    • 2 years ago
  23. Calcmathlete Group Title
    Best Response
    You've already chosen the best response.
    Medals 3

    There you go :)

    • 2 years ago
  24. J.L. Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    You are truly awesome

    • 2 years ago
  25. Calcmathlete Group Title
    Best Response
    You've already chosen the best response.
    Medals 3

    lol Thanks @lgbasallote Clearly you need to brush up on those geometry skills ;)

    • 2 years ago
  26. lgbasallote Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    ...clearly...

    • 2 years ago
  27. lgbasallote Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    hmm it always is 42 huh

    • 2 years ago
    • Attachments:

See more questions >>>

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.