SOLUTION: This is for painting purposes. This is a possible question on a contractor licensing test. The inside floor area of a silo is 20sf and 35ft high. What is the inside wall area.

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Question 883621: This is for painting purposes. This is a possible question on a contractor
licensing test.
The inside floor area of a silo is 20sf and 35ft high. What is the inside
wall area.
Thank you
Rodger
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
The inside floor area of a silo is 20sf and 35ft high. What is the inside
wall area.
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Assuming it's round (a cylinder with a flat top):
Find the radius.
Area+=+pi%2Ar%5E2+=+20
r+=+sqrt%2820%2Fpi%29
r =~ 2.523 ft
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For the vertical wall:
Area+=+2pi%2Ar%2Ah+=+2%2Api%2A2.523%2A35
Area = 554.87 sq ft
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If the top is flat, that's another 20 sq ft
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If the top is a hemisphere:
Area+=+2pi%2Ar%5E2
= another 40 sq ft