We looked at the coordinate plane, and refreshed our memories on what the (x,y) coordinates mean. Then we looked at the line between two points (a,b) and (c,d), then we used a right triangle to derive the distance formula. Once students had the distance formula and saw it in action a couple times they seamed to be able to use it.
One other aspect of this chapter was the equation of a circle. Students liked this, and it worked well because they got to see how shapes can be shifted and moved in the coordinate plane. Exciting!
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