I use this worksheet instead of a lecture. At the start of class, I give the students a mini-lesson, showing them the concept of the centroid, including a demonstration of a cardboard triangle for which I've already constructed the centroid, which I can balance on my fingertip.
After that, I like to get the students to work on this worksheet. It includes a reference portion with appropriate formulas for them and it has them apply the formulas to different situations involving the centroid.
I use this activity within cooperative groups, and I circulate to make sure they are getting the purpose of the questions.
The file includes spiral review problems.
This worksheet is intended to be written on directly.
Please download the pdf preview file first, so you can see exactly what's included; the product file is a word document, which you may personalize for your students.
Immediately before this worksheet, I use the worksheet named 'Angle Bisectors and Incenters Fall 2013' (http://www.teacherspayteachers.com/Product/Angle-Bisectors-and-Incenters-Fall-2013-1070261
), and immediately after this worksheet, I use the resource named 'Final Exam Study Guide Geometry Fall 2013' (http://www.teacherspayteachers.com/Product/Final-Exam-Study-Guide-Geometry-Fall-2013-1082707