Hey can u guys help me with the surface area of a cylinder I just can't seem to grasp it, i would appreciate it a lot!
2007-12-01 11:48:31 · 4 answers · asked by erb 2 in Education & Reference ➔ Homework Help
Here's a simple explanation:
A cylinder has three surfaces.
2 circles
1 rectangle
The two circles both have the same area, and are the bases.
The rectangle is the body of the cylinder. Think about it: If you were to unwrap the body of the cylinder you would get a rectangle!
Now, you need to find the area of all of the surfaces of the cylinder (this is after all, the surface area!).
To find the surface area of the bases (the two circles) use this formula:
2XpiXthe radius of one of the circles squared.
To find the area of the rectangle:
Find the circumference of one of the circles by using the formula C=piXdiameter.
Then you just multiply the circumference by the height.
Here is a good website to use it has a practice problems and answers on it. Good luck on your test! I hope I've helped plenty!
http://regentsprep.org/Regents/math/fsolid/Solids2.htm
Also, here's a link to a website also from Regents Prep for any other math tests you'll be doing in the future! They are very helpful trust me:
http://www.clcmn.edu/kschulte/mathworksheets.html
Good luck once again!
2007-12-01 12:07:11 · answer #1 · answered by :o) Sunshine 3 · 0⤊ 0⤋
Surface Area of Cylinders.
To find the surface area of a cylinder add the surface area of each end plus the surface area of the side. The surface area of each end is the ¶r2. There are two ends so their combinded surface area is 2*¶r2. The surface area of the side is the circumference times the height or 2¶rh.
The entire formula for the surface area of a cylinder is 2*¶r2 + 2¶rh.
I took that straight from their website. Basically it's 2(pie)r(squared).....which is the surface area of the top and bottom circles (remember there are 2 of them) then you add 2(pie)rh
2007-12-01 19:55:33 · answer #2 · answered by alexia_star_2002 2 · 1⤊ 0⤋
Cylinder (surface area) = 2 * pi * radius * height
2007-12-01 19:55:37 · answer #3 · answered by pamreid 6 · 0⤊ 1⤋
Think of the surface as a rectangular sheet.
One side being the height of the cylinder.
The other side is the circumference of a circle.
So calculate the circumference (PiD)* height.
2007-12-01 19:54:11 · answer #4 · answered by Robert S 7 · 0⤊ 0⤋