Pre-Algebra: 10.4 Area of Circles

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 http://www.geogebratube.org/material/show/id/15215.                                        Anthony Or. Education Bureau, Hong Kong.                                        orchiming@gmail.com (繁體中文版:http://www.geogebratube.org/material/show/id/550)

 

John Harris

 
Material Type
Activity
Tags
calculus  circle  proof  calculus  area  limit  integration  integral  circumference  sector 
Target Group (Age)
11 – 14
Language
English (United Kingdom)
 
 
GeoGebra version
4.0
Views
3153
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