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January 31, 2015

January 31, 2015

Posted by **John** on Wednesday, June 1, 2011 at 1:00am.

- Geometry -
**Mgraph**, Wednesday, June 1, 2011 at 2:47amThe surface area

SA=Pi*r^2+Pi*r*s, s=sqrt(r^2+h^2)

500*Pi=Pi*r^2+Pi*r*sqrt(r^2+225)

500=r^2+r*sqrt(r^2+225)

500-r^2=r*sqrt(r^2+225)

(500-r^2)^2=(r*sqrt(r^2+225))^2

250000-1000r^2+r^4=r^2(r^2+225)

250000=1225r^2

r^2=250000/1225

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