Curated OER
Angles, Parallel Lines, and Polygons
Learners examine how to investigate polygons using an instrument of their own construction. They should be able to prove the general formula for the number of degrees in any polygon (including a triangle). Finally they investigate an...
Curated OER
Area of Solids
Students find the area of rectangular solids and cylinders by cutting them into flat pieces and adding the areas.
Curated OER
Prints and Outlines
Young scholars determine the area of two objects by superimposing one on the other. They compare and order the area of different shapes by covering a larger shape with similar smaller ones. They complete these activities as different...