Got Homework?
Connect with other students for help. It's a free community.
Here's the question you clicked on:
 0 viewing
hba
Group Title
If the radius of a circle is increased by 10 % then the area is increased by,
 one year ago
 one year ago
hba Group Title
If the radius of a circle is increased by 10 % then the area is increased by,
 one year ago
 one year ago

This Question is Closed

tkhunny Group TitleBest ResponseYou've already chosen the best response.1
\(\pi r^2\) \(\pi (r*1.1)^{2} = 1.21\cdot\pi r^{2}\) What do you think?
 one year ago

hba Group TitleBest ResponseYou've already chosen the best response.0
@hartnn Yeah lol ? It is a circle but it is a very diff ques..
 one year ago

hba Group TitleBest ResponseYou've already chosen the best response.0
@tkhunny You are welcome to provide hints and explain
 one year ago

tkhunny Group TitleBest ResponseYou've already chosen the best response.1
Already did. Radius increased by 10%  r*1.1 Area is increased by ???
 one year ago

hba Group TitleBest ResponseYou've already chosen the best response.0
Please explain how did you do the first step
 one year ago

tkhunny Group TitleBest ResponseYou've already chosen the best response.1
Area of a Circle = \(\pi r^{2}\), given the radius. That's the first step.
 one year ago

hba Group TitleBest ResponseYou've already chosen the best response.0
I know that the Area of a circle = pi r^2
 one year ago

tkhunny Group TitleBest ResponseYou've already chosen the best response.1
New Radius is 10% greater than old radius. R = r*1.1 Area of new circle: \(\pi R^{2}\).
 one year ago

hba Group TitleBest ResponseYou've already chosen the best response.0
Got it what next ?
 one year ago

tkhunny Group TitleBest ResponseYou've already chosen the best response.1
Raio of New Area to Old Area \(\dfrac{\pi R^{2}}{\pi r^{2}}\).
 one year ago

tkhunny Group TitleBest ResponseYou've already chosen the best response.1
*Ratio  right A little algebra \(\dfrac{\pi R^{2}}{\pi r^{2}} = \dfrac{R^{2}}{r^{2}} = \dfrac{(1.1\cdot r)^{2}}{r^{2}} = \dfrac{1.1^{2}r^{2}}{r^{2}} = 1.1^{2} = 1.21\) And we see a 21% increase!
 one year ago
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
 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.