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Geometry/Area - Sphere

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Expert: Azeem Hussain - 5/18/2009


Question
I recently took a geometry test, and i am required to correct all wrong answers.  The only question I seem to have trouble with is this.  "You are required to paint a water tower with a cylindrical base and a spherical top.  The cylinder has a base that is 12ft around and 85 ft high, and the sphere is 300ft around.  If a gallon of paint is 35$ per gallon, and one gallon covers 200 square feet, how much money do you spend on paint?"  Every website i go to says that to find the area of a sphere, you need the radius. How would i go about finding the area of the sphere?

Answer
Hello Roman,

The radius of a sphere can be found from its diameter, exactly as you would do for a circle: divide the circumference by 2π.
c=2πr
r=c/(2π)

In this case your radius would be 300/(2π).

Ask a follow-up if you need anymore help,
Azeem

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Azeem Hussain

Expertise

I can answer mostly any kind of question dealing with of Math 536 and below, my forte being in parabolic functions and analytical geometry.

Experience

Drop-in tutor at Champlain College since 2010. I am neither a professor nor a teacher of this subject. I am merely a student who is good at mathematics and enjoys being of service to his community. I frequently tutor people in math and the results are usually great.

Education/Credentials
Presently enrolled in Materials Engineering at McGill University. Diploma of Collegiate Studies; Pure and Applied Science, Champlain College Saint-Lambert. Diploma of Secondary Studies from Chambly Academy High School. Being a Quebecer, I am fluent in English and French and can respond to questions easily in both languages.

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