Area of a Circle

Explore the formula for the area of a circle, by cutting it into sectors and rearranging the sectors to form a figure close to a parallelogram. By increasing the no. of sectors, students observe that the figure tends to a rectangle and get the formula for the area of the circle by finding the area of this rectangle. See also how I design the applets in                                        Anthony Or. GeoGebra Institute of Hong Kong.                               (繁體中文版:


C.J. Carlson

Resource Type
area  circle  circumference  exploration  pi 
Target Group (Age)
11 – 14
English (United Kingdom)
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