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If the radius of a circle is increased by 10 % then the area is increased by,
 one year ago
 one year ago
If the radius of a circle is increased by 10 % then the area is increased by,
 one year ago
 one year ago

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tkhunnyBest 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

hbaBest 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

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

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

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

tkhunnyBest 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

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

tkhunnyBest 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

tkhunnyBest 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

tkhunnyBest 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
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