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PLEASE HELP:
The area of a circle is given by A=πr^2, where r is the radius. If the radius of a circle is increased y 4 inches, the area of the resulting circle is 100π square inches. Find the radius of the original circle.
 one year ago
 one year ago
PLEASE HELP: The area of a circle is given by A=πr^2, where r is the radius. If the radius of a circle is increased y 4 inches, the area of the resulting circle is 100π square inches. Find the radius of the original circle.
 one year ago
 one year ago

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Mathhelp346Best ResponseYou've already chosen the best response.0
This is what I did, but it's wrong. dw:1354247106626:dw
 one year ago

Bronco101Best ResponseYou've already chosen the best response.1
dw:1354247301693:dw
 one year ago

Bronco101Best ResponseYou've already chosen the best response.1
you just forgot the pi and it increased by for not multiplied by 4 so you only add 4
 one year ago

Bronco101Best ResponseYou've already chosen the best response.1
dw:1354247411483:dw
 one year ago

Bronco101Best ResponseYou've already chosen the best response.1
so you squarroot everything and get r+4=10
 one year ago

Mathhelp346Best ResponseYou've already chosen the best response.0
am i supposed to divide it all?
 one year ago

Bronco101Best ResponseYou've already chosen the best response.1
yeah beacuse you have to do the same thing on each side like you subrtract numbers from each side
 one year ago

Mathhelp346Best ResponseYou've already chosen the best response.0
but if i divide everything, wouldn't everything cancel out besides 100?
 one year ago

Mathhelp346Best ResponseYou've already chosen the best response.0
nevermind i understand now
 one year ago
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