Visual Proof for Area of a Circle

This worksheet demonstrates the area of a disk (A.K.A. circle) by unrolling it into a simple triangle & finding the triangle's area. Size of the circle can be adjusted as well, for your pleasure. If you are in need for better proof, go to [url][/url].


Yehchan Yoo

Resource Type
area  circle  pi  triangle  unroll 
Target Group (Age)
11 – 14
English (United States)
© 2018 International GeoGebra Institute