A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

anonymous

  • one year ago

The sum of the interior angles of a heptagon is? A.) 900° B.) 1,080° C.) 1,260° D.) 1,440° I got A, but not for sure.

  • This Question is Closed
  1. mathstudent55
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    How many sides does a heptagon have?

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

    7?

  3. mathstudent55
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    triangle = 3 sides quadrilateral = 4 sides pentagon = 5 sides hexagon = 6 sides heptagon = 7 sides octagon = 9 sides nonagon = 9 sides decagon = 10 sides

  4. mathstudent55
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Correct.

  5. mathstudent55
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Now just use the same formula you have used in the last two problems. Here it is again: \(S = (n - 2)180\) where S = sum of the measures of the interior angles, and n = number of sides.

  6. mathstudent55
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Rewrite the formula exactly as it is. The more you write it, the faster you'll memorize it. Then rewrite it with 7 instead of n. \(S = (n - 2)180\) \(S = (7 - 2)180\) Now do 7 - 2. What is 7 - 2 = ?

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

    5

  8. mathstudent55
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Great. Now you write: \(S = 5(180) \) Finally, what is 5 * 180 = ?

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

    900

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

    Thank you!

  11. mathstudent55
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Correct. This is what your notebook should look like: \(S = (n - 2)180\) \(S = (7 - 2)180\) \(S = 5(180) \) \(S = 900\) The sum of the measures of the interior angles of a heptagon is 900 degrees.

  12. mathstudent55
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    If you always start with the formula you will have to advantages: 1. you will get the formula right 2. you will memorize the formula from writing it many times

  13. mathstudent55
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    You're welcome.

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

    • Attachments:

Ask your own question

Sign Up
Find more explanations on OpenStudy
Privacy Policy

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.