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

Yasminelove1

What is the approximate perimeter of the composite figure shown? Use three point one four for pi.

  • one year ago
  • one year ago

  • This Question is Closed
  1. Yasminelove1
    Best Response
    You've already chosen the best response.
    Medals 1

    • one year ago
    1 Attachment
  2. ash2326
    Best Response
    You've already chosen the best response.
    Medals 2

    Can you find the area of right triangle with base 5 mi and height 5 mi?

    • one year ago
  3. Yasminelove1
    Best Response
    You've already chosen the best response.
    Medals 1

    no

    • one year ago
  4. ash2326
    Best Response
    You've already chosen the best response.
    Medals 2

    Do you know the formula for area of right triangle and\or circle?

    • one year ago
  5. Yasminelove1
    Best Response
    You've already chosen the best response.
    Medals 1

    A=1/2xbxh or A=bxh/2

    • one year ago
  6. Yasminelove1
    Best Response
    You've already chosen the best response.
    Medals 1

    Circle Area = π × r2 Circumference = 2 × π × r r = radius

    • one year ago
  7. ash2326
    Best Response
    You've already chosen the best response.
    Medals 2

    Good, you're right here for the triangle b=5 mi h=5 mi \[\frac 1 2 b\times h\] Just plugin the values, you'll get the area of triangle

    • one year ago
  8. Yasminelove1
    Best Response
    You've already chosen the best response.
    Medals 1

    wat do you mean by that

    • one year ago
  9. ash2326
    Best Response
    You've already chosen the best response.
    Medals 2

    put b=5 and h=5, then solve it to find the area of triangle

    • one year ago
  10. Yasminelove1
    Best Response
    You've already chosen the best response.
    Medals 1

    ok

    • one year ago
  11. Yasminelove1
    Best Response
    You've already chosen the best response.
    Medals 1

    so ur saying 5x5x3.14

    • one year ago
  12. ash2326
    Best Response
    You've already chosen the best response.
    Medals 2

    Nope, \[\text{Area of figure}=\text{Area of triangle+ Area of circle}\] \[\text{Area of triangle}=\frac 1 2 \times 5 \times 5\ mi^2\]

    • one year ago
  13. Yasminelove1
    Best Response
    You've already chosen the best response.
    Medals 1

    oh ok i get 12 1/2 tho

    • one year ago
  14. ash2326
    Best Response
    You've already chosen the best response.
    Medals 2

    Yes, you're right. Now we need to find the area of semi circle, It's diameter is 7 mi Can you find the area?

    • one year ago
  15. Yasminelove1
    Best Response
    You've already chosen the best response.
    Medals 1

    A semi-circle is half of a circle and the area of a circle of radius r is pi r2. We know that the area of a circle is: area of a circle = pi r2 A semi-circle is half of a circle. Therefore the area of a semi-circle will be: area of a semi-circle = 1/2 pi r2 We know that the radius is 9ft. Pi is approximately 3.14 or 22/7. Now you just have to plug in the numbers and you will find the area!

    • one year ago
  16. ash2326
    Best Response
    You've already chosen the best response.
    Medals 2

    What's the radius here?

    • one year ago
  17. Yasminelove1
    Best Response
    You've already chosen the best response.
    Medals 1

    First, let's look at the 2 dimensional region (base of solid) Each cross-section perpendicular to the x-axis is a "strip" of length e^x - 0 = e^x Now we can look at 3 dimensional solid Each cross-section perpendicular to the x-axis is a semi-circle with diameter = e^x So each cross-section has area = 1/2 (π r²) = 1/2 π (e^x/2)² = π/8 * e^(2x) Each very thin cross section of width dx has volume = π/8 * e^(2x) dx Integrating from x = -1 to x = 1, we get: Volume = ∫₋₁¹ π/8 * e^(2x) dx . . . . . . = π/16 * e^(2x) |₋₁¹ . . . . . . = π/16 (e^(2) - e^(-2)) . . . . . . = 1.4242647516

    • one year ago
  18. ash2326
    Best Response
    You've already chosen the best response.
    Medals 2

    From where are you posting this??? It's not relevant here

    • one year ago
  19. amistre64
    Best Response
    You've already chosen the best response.
    Medals 0

    @preetha we need to get shadow to clean up the database .....

    • one year ago
  20. amistre64
    Best Response
    You've already chosen the best response.
    Medals 0

    @shadowfiend might need your assistance in cleaning up some database material

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

    ?

    • one year ago
  22. amistre64
    Best Response
    You've already chosen the best response.
    Medals 0

    please check the users profile page for some rather inappropriate content.

    • one year ago
  23. amistre64
    Best Response
    You've already chosen the best response.
    Medals 0

    they also seem to have a habit of editing the content out of their questions :/

    • 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.