Hey....what's that funny looking thing Ms. Ireland?

It's a cylinder net and you will be working with one tomorrow. Specifically, you will be calculating the surface area and the curved area of one. We are going to have so much fun...

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. Each end is a circle so the surface area of each end is π * r², where r is the radius of the end. There are two ends so their combinded surface area is 2 π * r². The surface area of the side is the circumference times the height or 2 π * r * h, where r is the radius and h is the height of the side. Whew! That is a lot of information.

Here is the entire formula for the surface area of a cylinder is 2 π r² + 2 π r h. Remember BEDMAS, evaluate exponents first, then multiply, then add. VOILA, your done.

The curved surface area (CSA) of a cylinder with radius r and height h is given by

I think it is important that you can recognize the difference between the CSA and SA as well as the relationship that exists between both of them.

Today was a day that we hope will not repeat tomorrow. Some students, not all, were extremely vocal and as a consequence the class had time removed from recess. Remember, whatever you decide to do, there is always consequences, good or bad. It takes just as much time and effort to make a good choice as it does to make a bad choice. Think about it.

See you all tomorrow.

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