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Estimate the gallons of paint needed to cover the outside of a cylindrical silo which is 30 feet in diameter and 70 feet high.
Do not include any roof area.
The paint covers approximately 150 square feet/gallon.

  • math -

    area = pi D^2/4 h = [ pi (900)/4 ]70
    area/150 = gallons

  • math -

    15×15x 3.14=

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