Quantcast

A community for students. Sign up today!

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

stupidinmath

  • one year ago

---

  • This Question is Closed
  1. stupidinmath
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    I'm quite confused. i dont know now T.T arc length: l = 2(theta)(r)(theta/360) l = 2(90)(5)(90/360) l=225 225x4 = 900 perimeter is 900cm

  2. ganeshie8
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    arc length : \(\large l = 2 (\theta)r \frac{\pi}{360}\) now try

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

    oh, wrong formula. ok let me solve it:)

  4. lncognlto
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    This is just a thought, but wouldn't the perimeter of the shaded region be equal to the circumference of a circle with a radius of 5 cm?

  5. ganeshie8
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    Or, you can see that there are four quarter arcs of radius 5 which give u 1 complete perimeter of circle of radius 5

  6. ganeshie8
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    ^^ Yes :)

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

    my arc length is 7.85 so.. my perimeter of the shaded region is 31.42 approximately. is that right?

  8. ganeshie8
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    \(\large \color{red}{\checkmark}\) next try if you get lncognlto's suggestion...

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

    ah, yes, thanks. and yup, what he said was right:) I just need a complete solution though:) thanks guys

  10. ganeshie8
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    both methods are considered complete solutions :) u wlc :) however ur teacher wud get more impressed if u do the lncognlto's method...

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

    oh, haha, alright, will do that :)

  12. ganeshie8
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    good :D

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

    @ganeshie8 , if this is the problem.. would the formula still be 2(theta)(r)(pi/360) or it should be 2(theta)(2)(pi/180)?

    1 Attachment
  14. ganeshie8
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    Alright, here is the original formula :- arc length \(l = r\theta\) \(\theta\) is in radians

  15. ganeshie8
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    to convert given \(\theta\) degrees into \(\theta\) radians, u multiply \(\frac{2\pi}{360}\) which is same as multiplying \(\frac{\pi}{180}\) :- arc length \(l = r \theta \frac{2\pi}{360}\) \(\theta\) is in degrees now

  16. ganeshie8
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    for the triangle, did they give u any dimensions ?

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

    thank you so much. yep, ill post my solution later for checking:)

  18. lncognlto
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    May I give another thought? xD

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

    sure:)

  20. ganeshie8
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    sure :)

  21. lncognlto
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    If this triangle is equilateral, then the angles of each of the sectors is going to be 60 degrees. Thus three sectors together make 180 degrees, or half a circle. So the perimeter of the shaded region would then be equal to half the circumference of a circle with the radius equaling half the length of a side of the triangle.

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

    oh, that's right. smart one. Hahaha. will remember that:)

  23. ganeshie8
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    60 + 60 + 60 and 180 which one save u time ha ? I'm sure ur teacher wants u do this exactly as lcognlto suggests !

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

    i believe so too:)

  25. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Ask a Question
Find more explanations on OpenStudy

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.