Asked by john

Find the percent increase in the area of a circular pizza if the radius is increased from nine inches to ten inches.
Answered by Reiny
area of 9" pizza = 81π
area of 10" pizza = 100π
increase = 19π
percentage increase = 19π/(100π)(100%) = 19%
Answered by Anonymous
A=r^2*pi

(10^2*pi)/(9^2*pi)=100/81=1.23456790123

1.23456790123*100%=123.456790123%

123.456790123%-100%=23.456790123%

increse=23.456790123%
Answered by Ms. Sue
A = pi * r^2
A = 3.14 * 81
A = 254.34 sq. inches

Find the area of the larger pizza.

Divide the difference by the area of the smaller pizza.
Answered by Reiny
I should have taken 19π/(81π) for a 23.5% increase
as 'anonymous" and Ms Sue did

sorry about that.
Time to get a strong coffee.
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