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

zhane2015

A triangle has side lengths of 12 cm, 15 cm, and 20 cm. Classify it as acute, obtuse, or right. (1 point) acute obtuse right There is not enough information.

  • one year ago
  • one year ago

  • This Question is Closed
  1. zhane2015
    Best Response
    You've already chosen the best response.
    Medals 0

    I wanna choose Right...

    • one year ago
  2. Directrix
    Best Response
    You've already chosen the best response.
    Medals 3

    By the converse of the Pythagorean Theorem, if 20^2 = 15^2 + 12^2, then "right" is correct. Check the arithmetic and let us know. @zhane2015

    • one year ago
  3. Directrix
    Best Response
    You've already chosen the best response.
    Medals 3

    What is 20*20?

    • one year ago
  4. zhane2015
    Best Response
    You've already chosen the best response.
    Medals 0

    400

    • one year ago
  5. Directrix
    Best Response
    You've already chosen the best response.
    Medals 3

    Good. What is 15 times 15?

    • one year ago
  6. Directrix
    Best Response
    You've already chosen the best response.
    Medals 3

    You can enter "15 times 15" in the Google search box and get the product. @zhane2015

    • one year ago
  7. Directrix
    Best Response
    You've already chosen the best response.
    Medals 3

    > I wanna choose Right... @zhane2015 Suggest you not choose until the arithmetic is done.

    • one year ago
  8. zhane2015
    Best Response
    You've already chosen the best response.
    Medals 0

    225

    • one year ago
  9. Directrix
    Best Response
    You've already chosen the best response.
    Medals 3

    Okay. I'll do 12 times 12 to get 144.

    • one year ago
  10. Directrix
    Best Response
    You've already chosen the best response.
    Medals 3

    12 cm, 15 cm, and 20 cm. ------------------------ Question: Is 12^2 + 15^2 = 20^2 That is, is 144 + 225 = 400? Yes or No?

    • one year ago
  11. zhane2015
    Best Response
    You've already chosen the best response.
    Medals 0

    no

    • one year ago
  12. Directrix
    Best Response
    You've already chosen the best response.
    Medals 3

    Okay. Therefore, the triangle is NOT Right. That leaves Obtuse and Acute. Check out this attachment below: (comes from http://jwilson.coe.uga.edu/emt668/emat6680.folders/brooks/6690stuff/righttriangle/pythagconv.html )

    • one year ago
  13. zhane2015
    Best Response
    You've already chosen the best response.
    Medals 0

    OMG you're the Best!

    • one year ago
  14. Directrix
    Best Response
    You've already chosen the best response.
    Medals 3

    Let's test for acute. Is 400 < 225 + 144 [ Is 20^2 < 12^2 +15^2 ] Yes or No? @zhane2015

    • one year ago
  15. zhane2015
    Best Response
    You've already chosen the best response.
    Medals 0

    no

    • one year ago
  16. zhane2015
    Best Response
    You've already chosen the best response.
    Medals 0

    So it's obtuse

    • one year ago
  17. Directrix
    Best Response
    You've already chosen the best response.
    Medals 3

    Correct.

    • one year ago
  18. zhane2015
    Best Response
    You've already chosen the best response.
    Medals 0

    Thank You so much I really appreciate it

    • one year ago
  19. Directrix
    Best Response
    You've already chosen the best response.
    Medals 3

    Glad to help. Learn that theorem on the chart and you'll get all this type problem correct.

    • one year 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.