Friday, February 12, 2010


"I don't get it Ms. Ireland." I heard this quite a bit today. Well, maybe the links on the side will help. Geometry can be difficult, however, paying attention in class is really the key to success as well as asking questions. It's why I am there, to help you to understand.

Don't be afraid to ask. I guarantee you that the question you ask is probably the same question several other students want to ask, but they are shy, so they won't.

A few students still owe:

--Falling Star (computer research)
--Letter to Albert have a math mid-unit review on Tuesday

Have a nice long weekend. Make good choices.


Wednesday, February 10, 2010

You have to follow me....

closely when I am giving direct instruction, especially when we are talking about how to get an angle from a triangle. There is a link on the side. You might find it useful.

Some students have been extremely talkative. Some have asked why they have to stay in for recess on occasion. The answer is simple, if you are talking, you are not working, therefore, you will have to stay in and finish.


--Angles in Triangles
--Working with Words 1-4
--Letter to Albert (good copy)

Monday, February 1, 2010

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.