SOLUTION: I'm trying to find the surface area of a cylinder. It has a radius of 4.7m and a height of 12m. Please help.

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Question 726046: I'm trying to find the surface area of a cylinder. It has a radius of 4.7m and a height of 12m. Please help.
Found 2 solutions by Alan3354, Theo:
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
I'm trying to find the surface area of a cylinder. It has a radius of 4.7m and a height of 12m.
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The lateral area = 2*pi*r*h sq meters
Each end's area = pi*r^2

Answer by Theo(13342) About Me  (Show Source):
You can put this solution on YOUR website!
The surface area of a cylinder is equal to the lateral area plus the area of the top and bottom base.

The area of each base of the cylinder is equal to pi * r^2 which is equal to pi * (4.7)^2 which is equal to pi * 22.09 which is equal to 22.09 * pi.

multiply this by 2 to get a total of 44.18 * pi

the lateral area of the cylinder is equal to 2 * pi * r * h which is equal to 2 * pi * 4.7 * 12 which is equal to 112.8 * pi

add up 44.18 * pi and 112.8 * pi and you get a total surface area of 156.98 * pi.

this is the surface area in terms of pi.

multiply by the value of pi to get:

total surface area equals 493.1672148 square meters which can be rounded to however many decimal places you require.

here's a reference you can look at to see what these formulas mean.

http://www.mathopenref.com/cylinderarea.html