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 2 years 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.
 2 years 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.

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Mathhelp346
 2 years ago
Best ResponseYou've already chosen the best response.0This is what I did, but it's wrong. dw:1354247106626:dw

Bronco101
 2 years ago
Best ResponseYou've already chosen the best response.1dw:1354247301693:dw

Bronco101
 2 years ago
Best ResponseYou've already chosen the best response.1you just forgot the pi and it increased by for not multiplied by 4 so you only add 4

Bronco101
 2 years ago
Best ResponseYou've already chosen the best response.1dw:1354247411483:dw

Bronco101
 2 years ago
Best ResponseYou've already chosen the best response.1so you squarroot everything and get r+4=10

Mathhelp346
 2 years ago
Best ResponseYou've already chosen the best response.0am i supposed to divide it all?

Bronco101
 2 years ago
Best ResponseYou've already chosen the best response.1yeah beacuse you have to do the same thing on each side like you subrtract numbers from each side

Mathhelp346
 2 years ago
Best ResponseYou've already chosen the best response.0but if i divide everything, wouldn't everything cancel out besides 100?

Mathhelp346
 2 years ago
Best ResponseYou've already chosen the best response.0nevermind i understand now
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