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Generalizing Area of Polygons

Posted by Angie Seltzer on 4/2/2018 to 6-8 Geometry
Generalizing Area of Polygons
Why are there so many different formulas for area? You can help students by focusing on a general formula.

Area of Circles and Ellipses

Posted by Angie Seltzer on 3/12/2018 to 6-8 Geometry
Area of Circles and Ellipses
A ratio can help you find the area of any circle or ellipse.

Estimate Pi

Posted by Angie Seltzer on 3/13/2016 to 6-8 Geometry
Estimate Pi
Help students estimate the value of pi by comparing a circle to a square or hexagon.