What kind of activity could I use for memorizing the suraface area formula- SA= 2(pie) r(squared) + 2(pie)rh?

I think of it as cutting the ends off the can and then slicing through the rest of the can so it can be laid out flat to form a rectangle. The area of the circular ends is pir^2 each and the area of the rectangle is LW where the width is the height of the can, h, and the length is the circumference of the can 2pi r.

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One Response to “What kind of activity could I use for memorizing the suraface area formula- SA= 2(pie) r(squared) + 2(pie)rh?”

michael on May 31st, 2010 at 4:48 am

I think of it as cutting the ends off the can and then slicing through the rest of the can so it can be laid out flat to form a rectangle. The area of the circular ends is pir^2 each and the area of the rectangle is LW where the width is the height of the can, h, and the length is the circumference of the can 2pi r.
References :

Area List