Math Is Fun Forum

shyclaw

Member

From: Dagoba

Registered: 2015-03-23

Posts: 67

Please Help Me!!!!

I need help with Surface Area of Prisms and Cylinders!!! Its really got me stumped. Please help!!!

I am having trouble with this topic in particular. Could someone post a example problem and the answer??? It would really help me understand. I am not very good at math.

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"“A Jedi uses the Force for knowledge and defense, never for attack.”

-Yoda

Bob

Administrator

Registered: 2010-06-20

Posts: 10,134

Re: Please Help Me!!!!

hi shyclaw

Welcome to the forum.

There's a load of pictures of prisms here:

http://www.mathsisfun.com/geometry/prisms.html

That should give you an idea of what one is.

To get the surface area you need the area of each end and the area of the rectangular sides

So for a triangular prism surface area = (area of one end) x 2 + area of the three rectangular sides.

At the bottom of that page you'll find some questions so you can get some practice.

For a cylinder:

http://www.mathsisfun.com/geometry/cylinder.html

you need the area of each circular end plus the area of the curved surface.  If you imagine it 'unfolded' it is a rectangular shape with length equal to the length of the cylinder and width equal to the circumference of the circle.

Hope that helps.

If you are stuck with a question, post it here. 

Bob

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Children are not defined by school ...........The Fonz
You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei
Sometimes I deliberately make mistakes, just to test you!  …………….Bob

shyclaw

Member

From: Dagoba

Registered: 2015-03-23

Posts: 67

Re: Please Help Me!!!!

Thank you!!!!!!! This REALLY helps!!! Thanks sooo much! ☺

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"“A Jedi uses the Force for knowledge and defense, never for attack.”

-Yoda

Bob

Administrator

Registered: 2010-06-20

Posts: 10,134

Re: Please Help Me!!!!

You are welcome.

Post again when you next get stuck. 

Bob

---

Children are not defined by school ...........The Fonz
You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei
Sometimes I deliberately make mistakes, just to test you!  …………….Bob

shyclaw

Member

From: Dagoba

Registered: 2015-03-23

Posts: 67

Re: Please Help Me!!!!

Ok!

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"“A Jedi uses the Force for knowledge and defense, never for attack.”

-Yoda