A community for students.
Here's the question you clicked on:
 0 viewing
gabbyalicorn
 one year ago
What is the exact area of a circle whose diameter is 18 cm?
gabbyalicorn
 one year ago
What is the exact area of a circle whose diameter is 18 cm?

This Question is Closed

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1formula A = pi*r^2 pi = 3.14 approximately r = radius = half of diameter

gabbyalicorn
 one year ago
Best ResponseYou've already chosen the best response.0dw:1433387436296:dw

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1ok so each answer is in terms of pi, so ignore the pi's for now

gabbyalicorn
 one year ago
Best ResponseYou've already chosen the best response.0whats the radius?

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1diameter = 18 radius = half of diameter

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1then you plug that into A = pi*r^2

jabez177
 one year ago
Best ResponseYou've already chosen the best response.0\[3.14 \times 8 \times 8 \]

jabez177
 one year ago
Best ResponseYou've already chosen the best response.0Wait... Let me try this again...

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1again, ignore the pi's

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1every answer choice has a pi in it

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1but you found the radius to be 9, not 8

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1r^2 means r times r

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1idk how you're getting 9 x 8

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1r^2 = r x r = 9 x 9 = ?? I replaced the 'r's with 9 since the radius is 9

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.1yep so 81pi is your answer
Ask your own question
Sign UpFind 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
 Engagement 19 Mad Hatter
 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.