SOLUTION: the surface area of a right circular cylinder with a circular radius r and a height h is given by s= 2 pie r squared. explain why his is so. then find how much cardboard is needed
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Question 316753: the surface area of a right circular cylinder with a circular radius r and a height h is given by s= 2 pie r squared. explain why his is so. then find how much cardboard is needed to make a toilet paper tube if the tube is 4.5 inches long with a radius of 1 inch
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Imagine a cardboard tube.
Cut the tube lengthwise and unroll it.
The tube is now unrolled and flattened into a rectangle.
The length of the rectangle is along the cut line, .
The width of the rectangle is the circumference of the circle or .
The area of the rectangle is
Your surface area formula would only be correct if
sq.in. or approximately,
sq.in.
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